1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 // <iterator> 12 13 // <iterator> 14 // template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); 15 16 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17 17 // UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8 18 19 #include <vector> 20 #include <iterator> 21 22 #include "test_macros.h" 23 24 int main () 25 { 26 std::vector<int> c; 27 std::empty(c); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}} 28 } 29
