mirror of
https://github.com/boostorg/callable_traits.git
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88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
/*!
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Copyright (c) 2016 Barrett Adair
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#include <type_traits>
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#include <callable_traits/is_invokable_constexpr.hpp>
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#ifdef CALLABLE_TRAITS_DISABLE_CONSTEXPR_CHECKS
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int main(){ return 0; }
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#else
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#ifndef CT_ASSERT
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#define CT_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
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#endif //CT_ASSERT
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struct foo1 {
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int operator()() const {
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return 0;
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}
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};
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struct foo2 {
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constexpr int operator()(int) const {
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return 1;
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}
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constexpr int operator()() const {
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return 1;
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}
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};
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struct foo3 {
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constexpr int bar(int) const {
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return 1;
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}
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};
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constexpr int bar(const int&) {
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return 1;
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}
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using foo4 = std::integral_constant<decltype(&bar), &bar>;
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using foo1_pmf = std::integral_constant<decltype(&foo1::operator()), &foo1::operator()>;
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using foo3_pmf = std::integral_constant<decltype(&foo3::bar), &foo3::bar>;
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namespace ct = callable_traits;
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// value syntax
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CT_ASSERT(!ct::is_invokable_constexpr(foo1{}));
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CT_ASSERT(!ct::is_invokable_constexpr(foo1{}, 0));
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CT_ASSERT( ct::is_invokable_constexpr(foo2{}));
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CT_ASSERT( ct::is_invokable_constexpr(foo2{}, 0));
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CT_ASSERT(!ct::is_invokable_constexpr(foo4{}));
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CT_ASSERT( ct::is_invokable_constexpr(foo4{}, 0));
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CT_ASSERT(!ct::is_invokable_constexpr(foo1_pmf{}, foo1{}));
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CT_ASSERT(!ct::is_invokable_constexpr(foo1_pmf{}, foo1{}, 0));
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CT_ASSERT(!ct::is_invokable_constexpr(foo3_pmf{}, foo3{}));
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CT_ASSERT( ct::is_invokable_constexpr(foo3_pmf{}, foo3{}, 0));
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// type syntax
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CT_ASSERT(!ct::is_invokable_constexpr<foo1>());
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CT_ASSERT(!ct::is_invokable_constexpr<foo1, int>());
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CT_ASSERT( ct::is_invokable_constexpr<foo2>());
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CT_ASSERT( ct::is_invokable_constexpr<foo2, int>());
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CT_ASSERT(!ct::is_invokable_constexpr<foo4>());
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CT_ASSERT( ct::is_invokable_constexpr<foo4, int>());
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CT_ASSERT(!ct::is_invokable_constexpr<foo1_pmf, foo1&>());
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CT_ASSERT(!ct::is_invokable_constexpr<foo1_pmf, foo1&, int>());
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CT_ASSERT(!ct::is_invokable_constexpr<foo3_pmf, foo3&>());
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CT_ASSERT( ct::is_invokable_constexpr<foo3_pmf, foo3&, int>());
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int main() {}
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#endif
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