libcxx/test/std/utilities/format/format.tuple/format.pass.cpp

   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 // <format>
  14
  15 // template<class charT, formattable<charT>... Ts>
  16 //   struct formatter<pair-or-tuple<Ts...>, charT>
  17
  18 // template<class FormatContext>
  19 //   typename FormatContext::iterator
  20 //     format(see below& elems, FormatContext& ctx) const;
  21
  22 // Note this tests the basics of this function. It's tested in more detail in
  23 // the format functions tests.
  24
  25 #include <cassert>
  26 #include <concepts>
  27 #include <format>
  28 #include <iterator>
  29 #include <tuple>
  30 #include <utility>
  31
  32 #include "assert_macros.h"
  33 #include "format.functions.common.h"
  34 #include "make_string.h"
  35 #include "test_format_context.h"
  36 #include "test_macros.h"
  37
  38 #define SV(S) MAKE_STRING_VIEW(CharT, S)
  39
  40 template <class StringViewT, class Arg>
  41 void test(StringViewT expected, Arg arg) {
  42   using CharT      = typename StringViewT::value_type;
  43   using String     = std::basic_string<CharT>;
  44   using OutIt      = std::back_insert_iterator<String>;
  45   using FormatCtxT = std::basic_format_context<OutIt, CharT>;
  46
  47   const std::formatter<Arg, CharT> formatter;
  48
  49   String result;
  50   OutIt out             = std::back_inserter(result);
  51   FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
  52   formatter.format(arg, format_ctx);
  53   assert(result == expected);
  54 }
  55
  56 template <class CharT>
  57 void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
  58   using String     = std::basic_string<CharT>;
  59   using OutIt      = std::back_insert_iterator<String>;
  60   using FormatCtxT = std::basic_format_context<OutIt, CharT>;
  61   std::pair<parse_call_validator, parse_call_validator> arg;
  62
  63   String result;
  64   OutIt out             = std::back_inserter(result);
  65   FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
  66
  67   std::formatter<decltype(arg), CharT> formatter;
  68   std::basic_format_parse_context<CharT> ctx{fmt};
  69
  70   formatter.parse(ctx);
  71   formatter.format(arg, format_ctx);
  72 }
  73
  74 template <class CharT>
  75 void test_assure_parse_is_called() {
  76   using String     = std::basic_string<CharT>;
  77   using OutIt      = std::back_insert_iterator<String>;
  78   using FormatCtxT = std::basic_format_context<OutIt, CharT>;
  79   std::pair<parse_call_validator, parse_call_validator> arg;
  80
  81   String result;
  82   OutIt out = std::back_inserter(result);
  83   [[maybe_unused]] FormatCtxT format_ctx =
  84       test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
  85
  86   { // parse not called
  87     [[maybe_unused]] const std::formatter<decltype(arg), CharT> formatter;
  88     TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
  89   }
  90
  91   test_assure_parse_is_called(SV("5"));
  92   test_assure_parse_is_called(SV("n"));
  93   test_assure_parse_is_called(SV("m"));
  94   test_assure_parse_is_called(SV("5n"));
  95   test_assure_parse_is_called(SV("5m"));
  96 }
  97
  98 template <class CharT>
  99 void test() {
 100   test(SV("(1)"), std::tuple<int>{1});
 101   test(SV("(1, 1)"), std::tuple<int, CharT>{1, CharT('1')});
 102   test(SV("(1, 1)"), std::pair<int, CharT>{1, CharT('1')});
 103   test(SV("(1, 1, true)"), std::tuple<int, CharT, bool>{1, CharT('1'), true});
 104
 105   test_assure_parse_is_called<CharT>();
 106 }
 107
 108 void test() {
 109   test<char>();
 110 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
 111   test<wchar_t>();
 112 #endif
 113 }
 114
 115 int main(int, char**) {
 116   test();
 117
 118   return 0;
 119 }