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

   1 //===----------------------------------------------------------------------===//
   2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   3 // See https://llvm.org/LICENSE.txt for license information.
   4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   5 //
   6 //===----------------------------------------------------------------------===//
   7
   8 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
   9
  10 // UNSUPPORTED: GCC-ALWAYS_INLINE-FIXME
  11
  12 // <format>
  13
  14 // template<class charT, formattable<charT>... Ts>
  15 //   struct formatter<pair-or-tuple<Ts...>, charT>
  16
  17 // template<class FormatContext>
  18 //   typename FormatContext::iterator
  19 //     format(see below& elems, FormatContext& ctx) const;
  20
  21 // Note this tests the basics of this function. It's tested in more detail in
  22 // the format functions tests.
  23
  24 #include <cassert>
  25 #include <concepts>
  26 #include <format>
  27 #include <iterator>
  28 #include <tuple>
  29 #include <utility>
  30
  31 #include "assert_macros.h"
  32 #include "format.functions.common.h"
  33 #include "make_string.h"
  34 #include "test_format_context.h"
  35 #include "test_macros.h"
  36
  37 #define SV(S) MAKE_STRING_VIEW(CharT, S)
  38
  39 template <class StringViewT, class Arg>
  40 void test(StringViewT expected, Arg arg) {
  41   using CharT      = typename StringViewT::value_type;
  42   using String     = std::basic_string<CharT>;
  43   using OutIt      = std::back_insert_iterator<String>;
  44   using FormatCtxT = std::basic_format_context<OutIt, CharT>;
  45
  46   const std::formatter<Arg, CharT> formatter;
  47
  48   String result;
  49   OutIt out             = std::back_inserter(result);
  50   FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
  51   formatter.format(arg, format_ctx);
  52   assert(result == expected);
  53 }
  54
  55 template <class CharT>
  56 void test_assure_parse_is_called(std::basic_string_view<CharT> fmt) {
  57   using String     = std::basic_string<CharT>;
  58   using OutIt      = std::back_insert_iterator<String>;
  59   using FormatCtxT = std::basic_format_context<OutIt, CharT>;
  60   std::pair<parse_call_validator, parse_call_validator> arg;
  61
  62   String result;
  63   OutIt out             = std::back_inserter(result);
  64   FormatCtxT format_ctx = test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
  65
  66   std::formatter<decltype(arg), CharT> formatter;
  67   std::basic_format_parse_context<CharT> ctx{fmt};
  68
  69   formatter.parse(ctx);
  70   formatter.format(arg, format_ctx);
  71 }
  72
  73 template <class CharT>
  74 void test_assure_parse_is_called() {
  75   using String     = std::basic_string<CharT>;
  76   using OutIt      = std::back_insert_iterator<String>;
  77   using FormatCtxT = std::basic_format_context<OutIt, CharT>;
  78   std::pair<parse_call_validator, parse_call_validator> arg;
  79
  80   String result;
  81   OutIt out = std::back_inserter(result);
  82   [[maybe_unused]] FormatCtxT format_ctx =
  83       test_format_context_create<OutIt, CharT>(out, std::make_format_args<FormatCtxT>(arg));
  84
  85   { // parse not called
  86     [[maybe_unused]] const std::formatter<decltype(arg), CharT> formatter;
  87     TEST_THROWS_TYPE(parse_call_validator::parse_function_not_called, formatter.format(arg, format_ctx));
  88   }
  89
  90   test_assure_parse_is_called(SV("5"));
  91   test_assure_parse_is_called(SV("n"));
  92   test_assure_parse_is_called(SV("m"));
  93   test_assure_parse_is_called(SV("5n"));
  94   test_assure_parse_is_called(SV("5m"));
  95 }
  96
  97 template <class CharT>
  98 void test() {
  99   test(SV("(1)"), std::tuple<int>{1});
 100   test(SV("(1, 1)"), std::tuple<int, CharT>{1, CharT('1')});
 101   test(SV("(1, 1)"), std::pair<int, CharT>{1, CharT('1')});
 102   test(SV("(1, 1, true)"), std::tuple<int, CharT, bool>{1, CharT('1'), true});
 103
 104   test_assure_parse_is_called<CharT>();
 105 }
 106
 107 void test() {
 108   test<char>();
 109 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
 110   test<wchar_t>();
 111 #endif
 112 }
 113
 114 int main(int, char**) {
 115   test();
 116
 117   return 0;
 118 }