libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.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
  10 // UNSUPPORTED: no-localization
  11
  12 // TODO FMT This test should not require std::to_chars(floating-point)
  13 // XFAIL: availability-fp_to_chars-missing
  14
  15 // Basic test to validate ill-formed code is properly detected.
  16
  17 // <format>
  18
  19 // template<class Out, class... Args>
  20 //   Out format_to(Out out, const locale& loc,
  21 //                 format-string<Args...> fmt, const Args&... args);
  22 // template<class Out, class... Args>
  23 //   Out format_to(Out out, const locale& loc,
  24 //                 wformat-string<Args...> fmt, const Args&... args);
  25
  26 #include <format>
  27 #include <locale>
  28
  29 #include "test_macros.h"
  30
  31 extern char* out;
  32 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  33 extern wchar_t* wout;
  34 #endif
  35
  36 // clang-format off
  37
  38 void f() {
  39   std::format_to(out, std::locale(), "{"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  40   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  41
  42   std::format_to(out, std::locale(), "}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  43   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  44
  45   std::format_to(out, std::locale(), "{}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  46   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  47
  48   std::format_to(out, std::locale(), "{0}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  49   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  50
  51   std::format_to(out, std::locale(), "{:-}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  52   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  53
  54   std::format_to(out, std::locale(), "{:#}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  55   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  56
  57   std::format_to(out, std::locale(), "{:L}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  58   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  59
  60   std::format_to(out, std::locale(), "{0:{0}}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  61   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  62
  63   std::format_to(out, std::locale(), "{:.42d}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  64   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  65
  66   std::format_to(out, std::locale(), "{:d}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  67   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  68
  69 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  70   std::format_to(wout, std::locale(), L"{"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  71   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  72
  73   std::format_to(wout, std::locale(), L"}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  74   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  75
  76   std::format_to(wout, std::locale(), L"{}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  77   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  78
  79   std::format_to(wout, std::locale(), L"{0}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  80   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  81
  82   std::format_to(wout, std::locale(), L"{:-}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  83   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  84
  85   std::format_to(wout, std::locale(), L"{:#}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  86   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  87
  88   std::format_to(wout, std::locale(), L"{:L}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  89   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  90
  91   std::format_to(wout, std::locale(), L"{0:{0}}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  92   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  93
  94   std::format_to(wout, std::locale(), L"{:.42d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  95   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  96
  97   std::format_to(wout, std::locale(), L"{:d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  98   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  99 #endif
 100 }