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Add mp_replace_if_q

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This commit is contained in:
Peter Dimov
2017-10-21 21:51:14 +03:00
parent 4a8d6db171
commit e4c12368c6
4 changed files with 73 additions and 0 deletions
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7
doc/mp11/algorithm.adoc
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@ -396,6 +396,13 @@ Replaces all `T` elements of `L` for which `mp_to_bool<P<T>>` is `mp_true` with
|*mp_replace_if<L1, P, W>*|A~1~|W|...|A~n~
|===
## mp_replace_if_q<L, Q, W>
template<class L, class Q, class W> using mp_replace_if_q =
mp_replace_if<L, Q::template fn, W>;
As `mp_replace_if`, but takes a quoted metafunction.
## mp_replace_at_c<L, I, W>
template<class L, std::size_t I, class W> using mp_replace_at_c = /*...*/;

6
include/boost/mp11/algorithm.hpp
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@ -378,13 +378,19 @@ template<class L, template<class...> class P, class W> struct mp_replace_if_impl
template<template<class...> class L, class... T, template<class...> class P, class W> struct mp_replace_if_impl<L<T...>, P, W>
{
#if defined( BOOST_MSVC ) && BOOST_WORKAROUND( BOOST_MSVC, < 1920 )
template<class U> struct _f { using type = mp_if<P<U>, W, U>; };
using type = L<typename _f<T>::type...>;
#else
template<class U> using _f = mp_if<P<U>, W, U>;
using type = L<_f<T>...>;
#endif
};
} // namespace detail
template<class L, template<class...> class P, class W> using mp_replace_if = typename detail::mp_replace_if_impl<L, P, W>::type;
template<class L, class Q, class W> using mp_replace_if_q = mp_replace_if<L, Q::template fn, W>;
// mp_copy_if<L, P>
namespace detail

1
test/Jamfile
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@ -55,6 +55,7 @@ run mp_at_sf.cpp ;
run mp_take.cpp ;
run mp_replace.cpp ;
run mp_replace_if.cpp ;
run mp_replace_if_q.cpp ;
run mp_copy_if.cpp ;
run mp_remove.cpp ;
run mp_remove_if.cpp ;

59
test/mp_replace_if_q.cpp Normal file
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@ -0,0 +1,59 @@
// Copyright 2015, 2017 Peter Dimov.
//
// Distributed under the Boost Software License, Version 1.0.
//
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/utility.hpp>
#include <boost/core/lightweight_test_trait.hpp>
#include <type_traits>
#include <tuple>
#include <utility>
struct X1 {};
int main()
{
using boost::mp11::mp_list;
using boost::mp11::mp_replace_if_q;
using boost::mp11::mp_quote;
{
using L1 = mp_list<>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L1, mp_quote<std::is_const>, void>, L1>));
using L2 = mp_list<X1, X1 const, X1*, X1 const, X1*, X1*>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_volatile>, void>, L2>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_const>, void>, mp_list<X1, void, X1*, void, X1*, X1*>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_pointer>, void>, mp_list<X1, X1 const, void, X1 const, void, void>>));
}
{
using L1 = std::tuple<>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L1, mp_quote<std::is_const>, void>, L1>));
using L2 = std::tuple<X1, X1 const, X1*, X1 const, X1*, X1*>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_volatile>, void>, L2>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_const>, void>, std::tuple<X1, void, X1*, void, X1*, X1*>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_pointer>, void>, std::tuple<X1, X1 const, void, X1 const, void, void>>));
}
{
using L2 = std::pair<X1 const, X1*>;
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_volatile>, void>, L2>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_const>, void>, std::pair<void, X1*>>));
BOOST_TEST_TRAIT_TRUE((std::is_same<mp_replace_if_q<L2, mp_quote<std::is_pointer>, void>, std::pair<X1 const, void>>));
}
return boost::report_errors();
}