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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <string>
// template<class charT, class traits, class Allocator>
// basic_ostream<charT, traits>&
// operator<<(basic_ostream<charT, traits>& os,
// const basic_string_view<charT,traits> str);
#include <string_view>
#include <iosfwd>
template <class SV, class = void>
struct HasDecl : std::false_type {};
template <class SV>
struct HasDecl<SV, decltype(static_cast<void>(std::declval<std::ostream&>() << std::declval<SV&>()))> : std::true_type {};
int main() {
static_assert(HasDecl<std::string_view>::value, "streaming operator declaration not present");
}
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