libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.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
   9 // UNSUPPORTED: no-localization
  10
  11 // TODO FMT This test should not require std::to_chars(floating-point)
  12 // XFAIL: availability-fp_to_chars-missing
  13
  14 // Basic test to validate ill-formed code is properly detected.
  15
  16 // <format>
  17
  18 // template<class Out, class... Args>
  19 //   Out format_to(Out out, const locale& loc,
  20 //                 format-string<Args...> fmt, const Args&... args);
  21 // template<class Out, class... Args>
  22 //   Out format_to(Out out, const locale& loc,
  23 //                 wformat-string<Args...> fmt, const Args&... args);
  24
  25 #include <format>
  26 #include <locale>
  27
  28 #include "test_macros.h"
  29
  30 extern char* out;
  31 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  32 extern wchar_t* wout;
  33 #endif
  34
  35 // clang-format off
  36
  37 void f() {
  38   std::format_to(out, std::locale(), "{"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  39   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  40
  41   std::format_to(out, std::locale(), "}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  42   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  43
  44   std::format_to(out, std::locale(), "{}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  45   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  46
  47   std::format_to(out, std::locale(), "{0}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  48   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  49
  50   std::format_to(out, std::locale(), "{:-}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  51   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  52
  53   std::format_to(out, std::locale(), "{:#}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  54   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  55
  56   std::format_to(out, std::locale(), "{:L}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  57   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  58
  59   std::format_to(out, std::locale(), "{0:{0}}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  60   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  61
  62   std::format_to(out, std::locale(), "{:.42d}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  63   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  64
  65   std::format_to(out, std::locale(), "{:d}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  66   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  67
  68 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  69   std::format_to(wout, std::locale(), L"{"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  70   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  71
  72   std::format_to(wout, std::locale(), L"}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  73   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  74
  75   std::format_to(wout, std::locale(), L"{}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  76   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  77
  78   std::format_to(wout, std::locale(), L"{0}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  79   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  80
  81   std::format_to(wout, std::locale(), L"{:-}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  82   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  83
  84   std::format_to(wout, std::locale(), L"{:#}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  85   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  86
  87   std::format_to(wout, std::locale(), L"{:L}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  88   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  89
  90   std::format_to(wout, std::locale(), L"{0:{0}}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  91   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  92
  93   std::format_to(wout, std::locale(), L"{:.42d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  94   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  95
  96   std::format_to(wout, std::locale(), L"{:d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  97   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  98 #endif
  99 }