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42 lines
1.2 KiB
C++
42 lines
1.2 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 <callable_traits/config.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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//[ can_invoke_constexpr_member_function_pointer
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#include <type_traits>
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#include <callable_traits/can_invoke_constexpr.hpp>
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// NOTE: Due to non-compliance in MSVC, can_invoke_constexpr
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// always returns std::false_type on that compiler, which
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// causes a static assert below to fail.
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namespace ct = callable_traits;
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struct foo {
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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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using pmf_constant = std::integral_constant<decltype(&foo::bar), &foo::bar>;
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// can_invoke_constexpr returns true here because foo::bar
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// is constexpr, and the arguments are valid to INVOKE
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static_assert(ct::can_invoke_constexpr(pmf_constant{}, foo{}, 0), "");
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// can_invoke_constexpr returns false here because even though
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// foo::bar is constexpr, the arguments do not obey INVOKE rules
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static_assert(!ct::can_invoke_constexpr(pmf_constant{}, foo{}), "");
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int main() {}
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//]
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#endif
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