forked from boostorg/mp11
Feature/lambda (#96)
* added mp_lambda * launched GHA * skipped ICE-generating test in GCC < 4.9 * fixed GCC detection in workaround * test-skipped and documented GCC 4.8 bug * added missing s/const/CONST * tempirarily expanded macro to isolate problem with VS2017 * tried workaround for C3546 * tried another workaround * wrapped workaround up * dropped unnecessary devoiding in variadic (member) functions * temporary code to check VS compliance wrt function qualifiers * removed version printer * checked compliance with qualified (member) function partial specialization * checked each partial specialization individually * wrapped up VS2013 investigation * left variadics out of VS2013 * skipped noexcept-involving tests for VS2013 (keyword not supported) * given up on VS2013 support for mp_lambda * dropped lambda_devoid_args
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joaquintides
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195
include/boost/mp11/lambda.hpp
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195
include/boost/mp11/lambda.hpp
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#ifndef BOOST_MP11_LAMBDA_HPP_INCLUDED
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#define BOOST_MP11_LAMBDA_HPP_INCLUDED
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// Copyright 2024 Joaquin M Lopez Munoz.
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//
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// Distributed under the Boost Software License, Version 1.0.
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//
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/mp11/detail/config.hpp>
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#if BOOST_MP11_WORKAROUND(BOOST_MP11_MSVC, <= 1800)
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// mp_lambda not supported due to compiler limitations
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#else
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#include <boost/mp11/bind.hpp>
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#include <cstddef>
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#include <type_traits>
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#if defined(_MSC_VER) || defined(__GNUC__)
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# pragma push_macro( "I" )
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# undef I
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#endif
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namespace boost
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{
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namespace mp11
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{
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namespace detail
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{
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template<class T> struct lambda_impl;
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} // namespace detail
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// mp_lambda
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template<class T> using mp_lambda = typename detail::lambda_impl<T>::type;
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namespace detail
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{
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// base case (no placeholder replacement)
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template<class T> struct lambda_impl
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{
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template<class... U> using make = T;
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using type = mp_bind<make>;
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};
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// placeholders (behave directly as mp_bind expressions)
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template<std::size_t I> struct lambda_impl<mp_arg<I>>
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{
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using type = mp_arg<I>;
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};
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#define BOOST_MP11_SPECIALIZE_LAMBDA_IMPL(name, compound_type) \
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template<class T> using lambda_make_##name = compound_type; \
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\
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template<class T> struct lambda_impl<compound_type> \
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{ \
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using type = mp_bind<lambda_make_##name, mp_lambda<T>>; \
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};
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// [basic.type.qualifier]
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL(const, const T)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL(volatile, volatile T)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL(const_volatile, const volatile T)
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// [dcl.ptr]
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL(pointer, T*)
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// [dcl.ref]
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// GCC < 7 fails with template<class U> using make = U&;
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template<class T> struct lambda_impl<T&>
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{
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template<class U> using make = typename std::add_lvalue_reference<U>::type;
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using type = mp_bind<make, mp_lambda<T>>;
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};
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template<class T> struct lambda_impl<T&&>
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{
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template<class U> using make = typename std::add_rvalue_reference<U>::type;
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using type = mp_bind<make, mp_lambda<T>>;
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};
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// [dcl.array]
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL(array, T[])
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#undef BOOST_MP11_SPECIALIZE_LAMBDA_IMPL
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template<class T, std::size_t N> struct lambda_impl<T[N]>
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{
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template<class Q> using make = Q[N];
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using type = mp_bind<make, mp_lambda<T>>;
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};
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// [dcl.fct], [dcl.mptr] (member functions)
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#define BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(name, qualifier) \
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template<class R, class... T> using lambda_make_fct_##name = R(T...) qualifier; \
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\
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template<class R, class... T> struct lambda_impl<R(T...) qualifier> \
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{ \
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using type = mp_bind< \
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lambda_make_fct_##name, \
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mp_lambda<R>, mp_lambda<T>...>; \
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}; \
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\
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template<class R, class... T> using lambda_make_fct_##name##_ellipsis = \
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R(T..., ...) qualifier; \
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\
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template<class R, class... T> struct lambda_impl<R(T..., ...) qualifier> \
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{ \
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using type = mp_bind< \
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lambda_make_fct_##name##_ellipsis, \
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mp_lambda<R>, mp_lambda<T>...>; \
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}; \
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\
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template<class R, class C, class... T> using lambda_make_mfptr_##name = \
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R (C::*)(T...) qualifier; \
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\
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template<class R, class C, class... T> struct lambda_impl<R (C::*)(T...) qualifier> \
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{ \
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using type = mp_bind< \
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lambda_make_mfptr_##name, \
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mp_lambda<R>, mp_lambda<C>, mp_lambda<T>...>; \
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}; \
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\
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template<class R, class C, class... T> using lambda_make_mfptr_##name##_ellipsis = \
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R (C::*)(T..., ...) qualifier; \
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\
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template<class R, class C, class... T> struct lambda_impl<R (C::*)(T..., ...) qualifier> \
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{ \
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using type = mp_bind< \
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lambda_make_mfptr_##name##_ellipsis, \
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mp_lambda<R>, mp_lambda<C>, mp_lambda<T>...>; \
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};
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#define BOOST_MP11_EMPTY()
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(no_qualifier, BOOST_MP11_EMPTY())
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const, const)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(volatile, volatile)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_volatile, const volatile)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(ref, &)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_ref, const&)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(volatile_ref, volatile&)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_volatile_ref, const volatile&)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(rvalue_ref, &&)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_rvalue_ref, const&&)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(volatile_rvalue_ref, volatile&&)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_volatile_rvalue_ref, const volatile&&)
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#if (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L) || __cplusplus >= 201703L
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// P0012R1: exception specification as part of the type system
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(noexcept, noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_noexcept, const noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(volatile_noexcept, volatile noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_volatile_noexcept, const volatile noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(ref_noexcept, & noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_ref_noexcept, const& noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(volatile_ref_noexcept, volatile& noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_volatile_ref_noexcept, const volatile& noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(rvalue_ref_noexcept, && noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_rvalue_ref_noexcept, const&& noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(volatile_rvalue_ref_noexcept, volatile&& noexcept)
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BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR(const_volatile_rvalue_ref_noexcept, const volatile&& noexcept)
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#endif // P0012R1
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#undef BOOST_MP11_EMPTY
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#undef BOOST_MP11_SPECIALIZE_LAMBDA_IMPL_FCT_AND_MFPTR
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// [dcl.mptr] (data members)
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template<class T, class C> struct lambda_impl<T (C::*)>
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{
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template<class U, class D> using make = U (D::*);
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using type = mp_bind<make, mp_lambda<T>, mp_lambda<C>>;
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};
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// template class instantiation
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template<template <class...> class C, class... Ts> struct lambda_impl<C<Ts...>>
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{
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using type = mp_bind<C, mp_lambda<Ts>...>;
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};
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} // namespace detail
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} // namespace mp11
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} // namespace boost
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#if defined(_MSC_VER) || defined(__GNUC__)
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# pragma pop_macro( "I" )
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#endif
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#endif // mp_lambda supported
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#endif // #ifndef BOOST_MP11_LAMBDA_HPP_INCLUDED
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