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adding function example for is_constexpr

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badair
2016-03-31 01:59:08 -05:00
parent 9cc2840b31
commit 7d212fd67d
3 changed files with 62 additions and 16 deletions
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36
example/is_constexpr/function.cpp Normal file
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@@ -0,0 +1,36 @@
/*!
Copyright (c) 2016 Barrett Adair
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#include <type_traits>
#include <callable_traits/callable_traits.hpp>
// NOTE: Due to non-compliance in MSVC, is_constexpr always
// returns std::false_type on that compiler, which causes
// the static asserts below to fail.
namespace ct = callable_traits;
constexpr int foo(const int&) {
return 1;
}
int bar(const int&) {
return 1;
}
// for is_constexpr calls, function pointers must
// be passed as std::integral_constants
using F = std::integral_constant<decltype(&foo), &foo>;
using B = std::integral_constant<decltype(&bar), &bar>;
static_assert(ct::is_constexpr(F{}), "");
static_assert(ct::is_constexpr<F>(), "");
static_assert(!ct::is_constexpr(B{}), "");
static_assert(!ct::is_constexpr<B>(), "");
int main() { return 0; }

4
include/callable_traits/detail/any_arg.hpp
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@@ -65,10 +65,6 @@ namespace callable_traits {
template<std::size_t I>
const any_arg_evaluated<I> any_arg_evaluated<I>::value = {};
#undef CALLABLE_TRAITS_CONCAT_
#undef CALLABLE_TRAITS_CONCAT
#undef CALLABLE_TRAITS_INITIALIZE_ANY_ARG_VALUE
//any_arg is only used in unevaluated contexts
template<std::size_t I = 0>
struct any_arg : any_arg_evaluated<I> {

38
qtcreator/main/main.cpp
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@@ -1,22 +1,36 @@
/*
Copyright Barrett Adair 2016
/*!
Copyright (c) 2016 Barrett Adair
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http ://boost.org/LICENSE_1_0.txt)
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#include <type_traits>
#include <callable_traits/callable_traits.hpp>
struct foo{};
// NOTE: Due to non-compliance in MSVC, is_constexpr always
// returns std::false_type on that compiler, which causes
// the static asserts below to fail.
namespace ct = callable_traits;
using pmf = void(foo::*)();
using test = ct::add_const_qualifier<pmf>;
using expect = void(foo::*)() const;
static_assert(std::is_same<test, expect>{}, "");
int main() {
return 0;
constexpr int foo(const int&) {
return 1;
}
int bar(const int&) {
return 1;
}
// for is_constexpr calls, function pointers must
// be passed as std::integral_constants
using F = std::integral_constant<decltype(&foo), &foo>;
using B = std::integral_constant<decltype(&bar), &bar>;
static_assert(ct::is_constexpr(F{}), "");
static_assert(ct::is_constexpr<F>(), "");
static_assert(!ct::is_constexpr(B{}), "");
static_assert(!ct::is_constexpr<B>(), "");
int main() { return 0; }