mirror of
https://github.com/boostorg/callable_traits.git
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65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
/*
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Copyright Barrett Adair 2016
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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 <boost/callable_traits/remove_args.hpp>
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#include <tuple>
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#include "test.hpp"
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struct foo;
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template<std::size_t I, typename T, std::size_t Count>
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struct is_substitution_failure_remove_args {
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template<typename>
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static auto test(...) -> std::true_type;
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template<typename U,
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boost::callable_traits::remove_args_t<I, U, Count>* = nullptr>
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static auto test(int) -> std::false_type;
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static constexpr bool value = decltype(test<T>(0))::value;
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};
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template<std::size_t I, typename T, std::size_t Count = 1>
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void assert_sfinae_remove_args() {
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CT_ASSERT(is_substitution_failure_remove_args<I, T, Count>::value);
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}
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int main() {
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auto lambda = [](){};
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//SFINAE because parameter list not present/cannot be manipulated
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assert_sfinae_remove_args<0, decltype(lambda)>();
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assert_sfinae_remove_args<0, decltype(lambda)&>();
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assert_sfinae_remove_args<0, int>();
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assert_sfinae_remove_args<0, int &>();
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assert_sfinae_remove_args<0, int (* const &)()>();
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assert_sfinae_remove_args<0, int (foo::* &)()>();
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assert_sfinae_remove_args<0, int (foo::* const)()>();
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assert_sfinae_remove_args<0, int (foo::* const &)()>();
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assert_sfinae_remove_args<0, int (foo::* volatile)()>();
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assert_sfinae_remove_args<0, void>();
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assert_sfinae_remove_args<0, void*>();
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assert_sfinae_remove_args<0, void(**)()>();
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//SFINAE because index is out of range
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assert_sfinae_remove_args<17, void()>();
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assert_sfinae_remove_args<1, void()>();
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assert_sfinae_remove_args<2, void(int)>();
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assert_sfinae_remove_args<1, void(foo::*)(int)>();
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assert_sfinae_remove_args<2, void(foo::*)(int, int) const>();
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//SFINAE because index + count is out of range
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assert_sfinae_remove_args<0, void()>();
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assert_sfinae_remove_args<0, void(int), 2>();
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assert_sfinae_remove_args<0, void(foo::*)(int) volatile, 2>();
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assert_sfinae_remove_args<0, void(foo::*)(int, int), 3>();
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assert_sfinae_remove_args<1, void(foo::*)(int, int), 2>();
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}
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