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
31extern char* out;
32#ifndef TEST_HAS_NO_WIDE_CHARACTERS
33extern wchar_t* wout;
34#endif
35
36// clang-format off
37
38void 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}
101

source code of libcxx/test/std/utilities/format/format.functions/format_to.locale.verify.cpp