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view gcc/testsuite/g++.dg/cpp2a/udlit-class-nttp-ctad-neg.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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// PR c++/88095 // Test class non-type template parameters for literal operator templates. // Validate handling of failed class template argument deduction. // { dg-do compile { target c++2a } } namespace std { using size_t = decltype(sizeof(int)); } template <typename CharT, std::size_t N> struct fixed_string { constexpr static std::size_t length = N; constexpr fixed_string(...) { } // auto operator<=> (const fixed_string&) = default; }; // Missing deduction guide. template <fixed_string fs> constexpr std::size_t operator"" _udl() { return decltype(fs)::length; } static_assert("test"_udl == 5); // { dg-error "15:no matching function for call to" } // { dg-error "15:class template argument deduction failed" "" { target *-*-* } .-1 }