1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 10 11 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME 12 13 // [container.adaptors.format] 14 // For each of queue, priority_queue, and stack, the library provides the 15 // following formatter specialization where adaptor-type is the name of the 16 // template: 17 // 18 // template<class charT, class T, formattable<charT> Container, class... U> 19 // struct formatter<adaptor-type<T, Container, U...>, charT> 20 21 // template<class ParseContext> 22 // constexpr typename ParseContext::iterator 23 // parse(ParseContext& ctx); 24 25 // Note this tests the basics of this function. It's tested in more detail in 26 // the format functions test. 27 28 #include <cassert> 29 #include <concepts> 30 #include <format> 31 #include <memory> 32 #include <queue> 33 #include <stack> 34 35 #include "test_macros.h" 36 #include "make_string.h" 37 38 #define SV(S) MAKE_STRING_VIEW(CharT, S) 39 40 template <class Arg, class StringViewT> 41 constexpr void test_parse(StringViewT fmt, std::size_t offset) { 42 using CharT = typename StringViewT::value_type; 43 auto parse_ctx = std::basic_format_parse_context<CharT>(fmt); 44 std::formatter<Arg, CharT> formatter; 45 static_assert(std::semiregular<decltype(formatter)>); 46 47 std::same_as<typename StringViewT::iterator> auto it = formatter.parse(parse_ctx); 48 // std::to_address works around LWG3989 and MSVC STL's iterator debugging mechanism. 49 assert(std::to_address(it) == std::to_address(fmt.end()) - offset); 50 } 51 52 template <class StringViewT> 53 constexpr void test_parse(StringViewT fmt, std::size_t offset) { 54 test_parse<std::queue<int>>(fmt, offset); 55 test_parse<std::priority_queue<int>>(fmt, offset); 56 test_parse<std::stack<int>>(fmt, offset); 57 } 58 59 template <class CharT> 60 constexpr void test_fmt() { 61 test_parse(SV(""), 0); 62 test_parse(SV(":d"), 0); 63 64 test_parse(SV("}"), 1); 65 test_parse(SV(":d}"), 1); 66 } 67 68 constexpr bool test() { 69 test_fmt<char>(); 70 #ifndef TEST_HAS_NO_WIDE_CHARACTERS 71 test_fmt<wchar_t>(); 72 #endif 73 74 return true; 75 } 76 77 int main(int, char**) { 78 test(); 79 static_assert(test()); 80 81 return 0; 82 } 83