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Added Functional/OverloadedFunction source files.
[SVN r77025]
This commit is contained in:
Lorenzo Caminiti
293
include/boost/functional/overloaded_function.hpp
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293
include/boost/functional/overloaded_function.hpp
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@ -0,0 +1,293 @@
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// Copyright (C) 2009-2012 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0
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// (see accompanying file LICENSE_1_0.txt or a copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Home at http://www.boost.org/libs/functional/overloaded_function
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#ifndef DOXYGEN // Doxygen documentation only.
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#if !BOOST_PP_IS_ITERATING
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# ifndef BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_HPP_
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# define BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_HPP_
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# include <boost/functional/overloaded_function/detail/base.hpp>
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# include <boost/functional/overloaded_function/detail/function_type.hpp>
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# include <boost/functional/overloaded_function/config.hpp>
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# include <boost/preprocessor/iteration/iterate.hpp>
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# include <boost/preprocessor/repetition/enum.hpp>
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# include <boost/preprocessor/repetition/repeat.hpp>
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# include <boost/preprocessor/control/expr_iif.hpp>
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# include <boost/preprocessor/control/expr_if.hpp>
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# include <boost/preprocessor/comparison/greater.hpp>
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# include <boost/preprocessor/comparison/less.hpp>
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# include <boost/preprocessor/cat.hpp>
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# include <boost/preprocessor/arithmetic/add.hpp>
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# include <boost/preprocessor/tuple/eat.hpp>
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# include <boost/preprocessor/logical/and.hpp>
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# include <boost/preprocessor/logical/not.hpp>
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# include <boost/preprocessor/facilities/expand.hpp>
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#define BOOST_FUNCTIONAL_f_type(z, n, unused) \
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BOOST_PP_CAT(F, n)
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#define BOOST_FUNCTIONAL_f_arg(z, n, unused) \
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BOOST_PP_CAT(f, n)
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#define BOOST_FUNCTIONAL_f_tparam(z, n, unused) \
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typename BOOST_FUNCTIONAL_f_type(z, n, ~) \
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#define BOOST_FUNCTIONAL_f_tparam_dflt(z, n, is_tspec) \
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BOOST_FUNCTIONAL_f_tparam(z, n, ~) \
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/* overload requires at least 2 functors so F0 and F1 not optional */ \
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BOOST_PP_EXPR_IIF(BOOST_PP_AND(BOOST_PP_NOT(is_tspec), \
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BOOST_PP_GREATER(n, 1)), \
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= void \
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)
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#define BOOST_FUNCTIONAL_f_arg_decl(z, n, unused) \
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BOOST_FUNCTIONAL_f_type(z, n, ~) /* no qualifier to deduce tparam */ \
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BOOST_FUNCTIONAL_f_arg(z, n, ~)
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#define BOOST_FUNCTIONAL_g_type(z, n, unused) \
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BOOST_PP_CAT(G, n)
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#define BOOST_FUNCTIONAL_g_arg(z, n, unused) \
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BOOST_PP_CAT(g, n)
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#define BOOST_FUNCTIONAL_g_tparam(z, n, unused) \
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typename BOOST_FUNCTIONAL_g_type(z, n, ~)
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#define BOOST_FUNCTIONAL_g_arg_decl(z, n, unused) \
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BOOST_FUNCTIONAL_g_type(z, n, ~) /* no qualifier to deduce tparam */ \
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BOOST_FUNCTIONAL_g_arg(z, n, ~)
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#define BOOST_FUNCTIONAL_base(z, n, unused) \
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::boost::overloaded_function_detail::base< \
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BOOST_FUNCTIONAL_f_type(z, n, ~) \
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>
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#define BOOST_FUNCTIONAL_inherit(z, n, unused) \
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public BOOST_FUNCTIONAL_base(z, n, ~)
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#define BOOST_FUNCTIONAL_base_init(z, n, unused) \
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BOOST_FUNCTIONAL_base(z, n, ~)(BOOST_FUNCTIONAL_g_arg(z, n, ~))
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#define BOOST_FUNCTIONAL_using_operator_call(z, n, unused) \
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using BOOST_FUNCTIONAL_base(z, n, ~)::operator();
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#define BOOST_FUNCTIONAL_function_type(z, n, unused) \
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typename ::boost::overloaded_function_detail::function_type< \
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BOOST_FUNCTIONAL_f_type(z, n, ~) \
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>::type
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namespace boost {
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// Iterate within namespace.
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# define BOOST_PP_ITERATION_PARAMS_1 \
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(3, (0, BOOST_PP_SUB( /*at least 2 func to overload 2, 3, ...*/\
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BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX, 2), \
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"boost/functional/overloaded_function.hpp"))
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# include BOOST_PP_ITERATE() // Iterate over function arity.
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} // namespace
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#undef BOOST_FUNCTIONAL_f_type
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#undef BOOST_FUNCTIONAL_f_arg
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#undef BOOST_FUNCTIONAL_f_tparam
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#undef BOOST_FUNCTIONAL_f_arg_decl
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#undef BOOST_FUNCTIONAL_f_tparam_dflt
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#undef BOOST_FUNCTIONAL_g_type
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#undef BOOST_FUNCTIONAL_g_arg
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#undef BOOST_FUNCTIONAL_g_tparam
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#undef BOOST_FUNCTIONAL_g_arg_decl
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#undef BOOST_FUNCTIONAL_base
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#undef BOOST_FUNCTIONAL_inherit
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#undef BOOST_FUNCTIONAL_base_init
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#undef BOOST_FUNCTIONAL_using_operator_call
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#undef BOOST_FUNCTIONAL_function_type
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# endif // #include guard
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#elif BOOST_PP_ITERATION_DEPTH() == 1
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# define BOOST_FUNCTIONAL_overloads \
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/* iterate as OVERLOADS, OVERLOADS-1, OVERLOADS-2, ... */ \
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BOOST_PP_SUB(BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX, \
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BOOST_PP_FRAME_ITERATION(1))
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# define BOOST_FUNCTIONAL_is_tspec \
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/* if template specialization */ \
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BOOST_PP_LESS(BOOST_FUNCTIONAL_overloads, \
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BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX)
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template<
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BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads, BOOST_FUNCTIONAL_f_tparam_dflt,
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BOOST_FUNCTIONAL_is_tspec)
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>
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class overloaded_function
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// Template specialization.
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BOOST_PP_EXPR_IIF(BOOST_PP_EXPAND(BOOST_FUNCTIONAL_is_tspec), <)
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BOOST_PP_IIF(BOOST_FUNCTIONAL_is_tspec,
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BOOST_PP_ENUM
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,
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BOOST_PP_TUPLE_EAT(3)
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)(BOOST_FUNCTIONAL_overloads, BOOST_FUNCTIONAL_f_type, ~)
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BOOST_PP_EXPR_IIF(BOOST_PP_EXPAND(BOOST_FUNCTIONAL_is_tspec), >)
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// Bases (overloads >= 2 so always at least 2 bases).
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: BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads,
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BOOST_FUNCTIONAL_inherit, ~)
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{
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public:
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template<
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BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads, BOOST_FUNCTIONAL_g_tparam, ~)
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> /* implicit */ inline overloaded_function(
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BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads,
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BOOST_FUNCTIONAL_g_arg_decl, ~))
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// Overloads >= 2 so always at least 2 bases to initialize.
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: BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads,
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BOOST_FUNCTIONAL_base_init, ~)
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{}
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BOOST_PP_REPEAT(BOOST_FUNCTIONAL_overloads,
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BOOST_FUNCTIONAL_using_operator_call, ~)
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};
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template<
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BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads, BOOST_FUNCTIONAL_f_tparam, ~)
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>
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overloaded_function<
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BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads, BOOST_FUNCTIONAL_function_type, ~)
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> make_overloaded_function(
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BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads, BOOST_FUNCTIONAL_f_arg_decl, ~)
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) {
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return overloaded_function<
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BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads,
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BOOST_FUNCTIONAL_function_type, ~)
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>(BOOST_PP_ENUM(BOOST_FUNCTIONAL_overloads, BOOST_FUNCTIONAL_f_arg, ~));
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}
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# undef BOOST_FUNCTIONAL_overloads
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# undef BOOST_FUNCTIONAL_is_tspec
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#endif // iteration
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// DOCUMENTATION //
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#else // DOXYGEN
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/** @file
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@brief Overload distinct function pointers, function references, and function
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objects into a single function object.
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*/
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namespace boost {
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/**
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@brief Function object to overload functions with distinct signatures.
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This function object aggregates together calls to functions of all the
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specified function types <c>F1</c>, <c>F2</c>, etc.
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The specified function types must have distinct parameters from one another and
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they must be in the following format (which is the Boost.Function preferred
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syntax):
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@code
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result_type (argument1_type, argumgnet2_type, ...)
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@endcode
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In some cases, the @RefFunc{make_overloaded_function} function template can be
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useful to construct the overloaded function object without explicitly
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specifying the function types.
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The maximum number of functions to overload is given by the
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@RefMacro{BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX}
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configuration macro.
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The maximum number of function parameters for each of the specified function
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types is given by the
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@RefMacro{BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX}
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configuration macro.
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@See
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@RefSect{Tutorial} section,
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@RefFunc{make_overloaded_function},
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@RefMacro{BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX},
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@RefMacro{BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX},
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Boost.Function.
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*/
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template<typename F1, typename F2, ...>
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class overloaded_function {
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public:
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/**
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@brief Construct the overloaded function object.
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Any function pointer, function reference, and monomorphic function object
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that can be converted to a <c>boost::function</c> function object can be
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specified as parameter.
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*/
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overloaded_function(const boost::function<F1>&,
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const boost::function<F2>&, ...);
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/**
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@brief Call operator matching the signature of the function type specified
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as 1st template parameter.
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This will in turn invoke the call operator of the 1st function passed to
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the constructor.
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*/
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typename boost::function_traits<F1>::result_type operator()(
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typename boost::function_traits<F1>::arg1_type,
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typename boost::function_traits<F1>::arg2_type,
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...) const;
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/**
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@brief Call operator matching the signature of the function type specified
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as 2nd template parameter.
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This will in turn invoke the call operator of the 2nd function passed to
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the constructor.
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@Note Similar call operators are present for all specified function types
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<c>F1</c>, <c>F2</c>, etc (even if not exhaustively listed by this
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documentation).
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*/
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typename boost::function_traits<F2>::result_type operator()(
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typename boost::function_traits<F2>::arg1_type,
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typename boost::function_traits<F2>::arg2_type,
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...) const;
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};
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/**
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@brief Make an overloaded function object without explicitly specifying the
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function types.
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This function template creates and returns an @RefClass{overloaded_function}
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function object that overloads all the specified functions <c>f1</c>,
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<c>f2</c>, etc.
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The function types are internally determined from the template parameter types
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so they do not need to be explicitly specified.
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Therefore, this function template usually has a more concise syntax when
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compared with @RefClass{overloaded_function}.
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This is especially useful when the explicit type of the returned
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@RefClass{overloaded_function} does not need to be known (e.g., when used with Boost.Typeof's <c>BOOST_AUTO</c> (or C++11 <c>auto</c>) or when the overloaded
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function object is handled using a function template parameter, see the
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@RefSect{Tutorial} section).
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The maximum number of functions to overload is given by the
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@RefMacro{BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX}
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configuration macro.
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@Note In this documentation, <c>__function_type__</c> is a placeholder for a
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symbol that is specific to implementation of this library.
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@See
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@RefSect{Tutorial} section,
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@RefClass{overloaded_function},
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@RefMacro{BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX}.
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*/
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template<typename F1, typename F2, ...>
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overloaded_function<
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__function_type__<F1>, __function_type__<F2>, ...
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> make_overloaded_function(F1 f1, F2 f2, ...);
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} // namespace
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#endif // DOXYGEN
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52
include/boost/functional/overloaded_function/config.hpp
Normal file
52
include/boost/functional/overloaded_function/config.hpp
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@ -0,0 +1,52 @@
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// Copyright (C) 2009-2012 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0
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// (see accompanying file LICENSE_1_0.txt or a copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Home at http://www.boost.org/libs/functional/overloaded_function
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#ifndef BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_HPP_
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#define BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_HPP_
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/** @file
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@brief Change the compile-time configuration of this library.
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*/
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/**
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@brief Specify the maximum number of arguments of the functions being
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overloaded.
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If this macro is left undefined by the user, it has a default value of 5
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(increasing this number might increase compilation time).
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When specified by the user, this macro must be a non-negative integer number.
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@See
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@RefSectId{Getting_Started, Getting Started},
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@RefClass{boost::overloaded_function}.
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*/
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#ifndef BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX
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#define BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX 5
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#endif
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/**
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@brief Specify the maximum number of functions that can be overloaded.
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If this macro is left undefined by the user, it has a default value of 5
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(increasing this number might increase compilation time).
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When defined by the user, this macro must be an integer number greater or
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equal than 2 (because at least two distinct functions need to be specified in
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order to define an overload).
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@See
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@RefSectId{Getting_Started, Getting Started},
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@RefClass{boost::overloaded_function}.
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*/
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#ifndef BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX
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#define BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX 5
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#endif
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#if BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX < 2
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#error "BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_OVERLOAD_MAX must be >= 2"
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#endif
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#endif // #include guard
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85
include/boost/functional/overloaded_function/detail/base.hpp
Normal file
85
include/boost/functional/overloaded_function/detail/base.hpp
Normal file
@ -0,0 +1,85 @@
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// Copyright (C) 2009-2012 Lorenzo Caminiti
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// Distributed under the Boost Software License, Version 1.0
|
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// (see accompanying file LICENSE_1_0.txt or a copy at
|
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// http://www.boost.org/LICENSE_1_0.txt)
|
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// Home at http://www.boost.org/libs/functional/overloaded_function
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#if !BOOST_PP_IS_ITERATING
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# ifndef BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_DETAIL_BASE_HPP_
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# define BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_DETAIL_BASE_HPP_
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# include <boost/functional/overloaded_function/config.hpp>
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# include <boost/function.hpp>
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# include <boost/preprocessor/iteration/iterate.hpp>
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# include <boost/preprocessor/repetition/enum.hpp>
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||||
# include <boost/preprocessor/cat.hpp>
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||||
# include <boost/preprocessor/comma_if.hpp>
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||||
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#define BOOST_FUNCTIONAL_DETAIL_arg_type(z, n, unused) \
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BOOST_PP_CAT(A, n)
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#define BOOST_FUNCTIONAL_DETAIL_arg_name(z, n, unused) \
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||||
BOOST_PP_CAT(a, n)
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||||
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||||
#define BOOST_FUNCTIONAL_DETAIL_arg_tparam(z, n, unused) \
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||||
typename BOOST_FUNCTIONAL_DETAIL_arg_type(z, n, unused)
|
||||
|
||||
#define BOOST_FUNCTIONAL_DETAIL_arg(z, n, unused) \
|
||||
BOOST_FUNCTIONAL_DETAIL_arg_type(z, n, unused) \
|
||||
BOOST_FUNCTIONAL_DETAIL_arg_name(z, n, unused)
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||||
|
||||
#define BOOST_FUNCTIONAL_DETAIL_f \
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||||
R (BOOST_PP_ENUM(BOOST_FUNCTIONAL_DETAIL_arity, \
|
||||
BOOST_FUNCTIONAL_DETAIL_arg_type, ~))
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||||
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||||
namespace boost { namespace overloaded_function_detail {
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||||
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||||
template<typename F>
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||||
class base {}; // Empty template cannot be used directly (only its spec).
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||||
# define BOOST_PP_ITERATION_PARAMS_1 \
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||||
(3, (0, BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_CONFIG_ARITY_MAX, \
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||||
"boost/functional/overloaded_function/detail/base.hpp"))
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||||
# include BOOST_PP_ITERATE() // Iterate over funciton arity.
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||||
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||||
} } // namespace
|
||||
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||||
#undef BOOST_FUNCTIONAL_DETAIL_arg_type
|
||||
#undef BOOST_FUNCTIONAL_DETAIL_arg_name
|
||||
#undef BOOST_FUNCTIONAL_DETAIL_arg_tparam
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||||
#undef BOOST_FUNCTIONAL_DETAIL_arg
|
||||
#undef BOOST_FUNCTIONAL_DETAIL_f
|
||||
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||||
# endif // #include guard
|
||||
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||||
#elif BOOST_PP_ITERATION_DEPTH() == 1
|
||||
# define BOOST_FUNCTIONAL_DETAIL_arity BOOST_PP_FRAME_ITERATION(1)
|
||||
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||||
template<
|
||||
typename R
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||||
BOOST_PP_COMMA_IF(BOOST_FUNCTIONAL_DETAIL_arity)
|
||||
BOOST_PP_ENUM(BOOST_FUNCTIONAL_DETAIL_arity,
|
||||
BOOST_FUNCTIONAL_DETAIL_arg_tparam, ~)
|
||||
>
|
||||
class base< BOOST_FUNCTIONAL_DETAIL_f > {
|
||||
public:
|
||||
/* implicit */ inline base(
|
||||
// This requires specified type to be implicitly convertible to
|
||||
// a boost::function<> functor.
|
||||
boost::function< BOOST_FUNCTIONAL_DETAIL_f > const& f): f_(f)
|
||||
{}
|
||||
|
||||
inline R operator()(BOOST_PP_ENUM(BOOST_FUNCTIONAL_DETAIL_arity,
|
||||
BOOST_FUNCTIONAL_DETAIL_arg, ~)) const {
|
||||
return f_(BOOST_PP_ENUM(BOOST_FUNCTIONAL_DETAIL_arity,
|
||||
BOOST_FUNCTIONAL_DETAIL_arg_name, ~));
|
||||
}
|
||||
|
||||
private:
|
||||
boost::function< BOOST_FUNCTIONAL_DETAIL_f > const f_;
|
||||
};
|
||||
|
||||
# undef BOOST_FUNCTIONAL_DETAIL_arity
|
||||
#endif // iteration
|
||||
|
||||
@ -0,0 +1,73 @@
|
||||
|
||||
// Copyright (C) 2009-2012 Lorenzo Caminiti
|
||||
// Distributed under the Boost Software License, Version 1.0
|
||||
// (see accompanying file LICENSE_1_0.txt or a copy at
|
||||
// http://www.boost.org/LICENSE_1_0.txt)
|
||||
// Home at http://www.boost.org/libs/functional/overloaded_function
|
||||
|
||||
#ifndef BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_DETAIL_FUNCTION_TYPE_HPP_
|
||||
#define BOOST_FUNCTIONAL_OVERLOADED_FUNCTION_DETAIL_FUNCTION_TYPE_HPP_
|
||||
|
||||
#include <boost/function_types/is_function.hpp>
|
||||
#include <boost/function_types/is_function_pointer.hpp>
|
||||
#include <boost/function_types/is_function_reference.hpp>
|
||||
#include <boost/function_types/function_type.hpp>
|
||||
#include <boost/function_types/parameter_types.hpp>
|
||||
#include <boost/function_types/result_type.hpp>
|
||||
#include <boost/type_traits/remove_pointer.hpp>
|
||||
#include <boost/type_traits/remove_reference.hpp>
|
||||
#include <boost/mpl/if.hpp>
|
||||
#include <boost/mpl/identity.hpp>
|
||||
#include <boost/mpl/pop_front.hpp>
|
||||
#include <boost/mpl/push_front.hpp>
|
||||
#include <boost/typeof/typeof.hpp>
|
||||
|
||||
namespace boost { namespace overloaded_function_detail {
|
||||
|
||||
// Requires: F is a monomorphic functor (i.e., has non-template `operator()`).
|
||||
// Returns: F's function type `result_type (arg1_type, arg2_type, ...)`.
|
||||
// It does not assume F typedef result_type, arg1_type, ... but needs typeof.
|
||||
template<typename F>
|
||||
class functor_type {
|
||||
typedef BOOST_TYPEOF_TPL(&(F::operator())) call_ptr;
|
||||
public:
|
||||
typedef
|
||||
typename boost::function_types::function_type<
|
||||
typename boost::mpl::push_front<
|
||||
typename boost::mpl::pop_front< // Remove functor type (1st).
|
||||
typename boost::function_types::parameter_types<
|
||||
call_ptr>::type
|
||||
>::type
|
||||
, typename boost::function_types::result_type<call_ptr>::type
|
||||
>::type
|
||||
>::type
|
||||
type;
|
||||
};
|
||||
|
||||
// Requires: F is a function type, pointer, reference, or monomorphic functor.
|
||||
// Returns: F's function type `result_type (arg1_type, arg2_type, ...)`.
|
||||
template<typename F>
|
||||
struct function_type {
|
||||
typedef
|
||||
typename boost::mpl::if_<boost::function_types::is_function<F>,
|
||||
boost::mpl::identity<F>
|
||||
,
|
||||
typename boost::mpl::if_<boost::function_types::
|
||||
is_function_pointer<F>,
|
||||
boost::remove_pointer<F>
|
||||
,
|
||||
typename boost::mpl::if_<boost::function_types::
|
||||
is_function_reference<F>,
|
||||
boost::remove_reference<F>
|
||||
, // Requires, it's a functor.
|
||||
functor_type<F>
|
||||
>::type
|
||||
>::type
|
||||
>::type
|
||||
::type type;
|
||||
};
|
||||
|
||||
} } // namespace
|
||||
|
||||
#endif // #include guard
|
||||
|
||||
Reference in New Issue
Block a user