libcxx/test/std/utilities/format/format.functions/format_to.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
  11 // TODO FMT This test should not require std::to_chars(floating-point)
  12 // XFAIL: availability-fp_to_chars-missing
  13
  14 // <format>
  15
  16 // Basic test to validate ill-formed code is properly detected.
  17
  18 // template<class Out, class... Args>
  19 //   Out format_to(Out out, format-string<Args...> fmt, const Args&... args);
  20 // template<class Out, class... Args>
  21 //   Out format_to(Out out, wformat-string<Args...> fmt, const Args&... args);
  22
  23 #include <format>
  24
  25 #include "test_macros.h"
  26
  27 extern char* out;
  28 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  29 extern wchar_t* wout;
  30 #endif
  31
  32 // clang-format off
  33
  34 void f() {
  35   std::format_to(out, "{"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
  36   // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
  37
  38   std::format_to(out, "}"); // 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, "{}"); // 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, "{0}"); // 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, "{:-}", "Forty-two"); // 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, "{:#}", "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, "{:L}", "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, "{0:{0}}", "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, "{:.42d}", "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, "{:d}", "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 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  66   std::format_to(wout, L"{"); // 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   std::format_to(wout, 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, 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, L"{0}"); // 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, L"{:-}", L"Forty-two"); // 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, 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, L"{: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, L"{0:{0}}", 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, L"{:.42d}", 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, L"{:d}", 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 #endif
  96 }