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... Args>
20// string format(const locale& loc, format-string<Args...> fmt, const Args&... args);
21// template<class... Args>
22// wstring format(const locale& loc, wformat-string<Args...> fmt, const Args&... args);
23
24#include <format>
25#include <locale>
26
27#include "test_macros.h"
28
29// clang-format off
30
31void f() {
32 TEST_IGNORE_NODISCARD std::format(std::locale(), "{"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
33 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
34
35 TEST_IGNORE_NODISCARD std::format(std::locale(), "}"); // 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 TEST_IGNORE_NODISCARD std::format(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 TEST_IGNORE_NODISCARD std::format(std::locale(), "{0}"); // 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 TEST_IGNORE_NODISCARD std::format(std::locale(), "{:-}", "Forty-two"); // 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 TEST_IGNORE_NODISCARD std::format(std::locale(), "{:#}", "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 TEST_IGNORE_NODISCARD std::format(std::locale(), "{:L}", "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 TEST_IGNORE_NODISCARD std::format(std::locale(), "{0:{0}}", "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 TEST_IGNORE_NODISCARD std::format(std::locale(), "{:.42d}", "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 TEST_IGNORE_NODISCARD std::format(std::locale(), "{:d}", "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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
63 TEST_IGNORE_NODISCARD std::format(std::locale(), L"{"); // 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 TEST_IGNORE_NODISCARD std::format(std::locale(), 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 TEST_IGNORE_NODISCARD std::format(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 TEST_IGNORE_NODISCARD std::format(std::locale(), L"{0}"); // 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 TEST_IGNORE_NODISCARD std::format(std::locale(), L"{:-}", L"Forty-two"); // 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 TEST_IGNORE_NODISCARD std::format(std::locale(), 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 TEST_IGNORE_NODISCARD std::format(std::locale(), L"{: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 TEST_IGNORE_NODISCARD std::format(std::locale(), L"{0:{0}}", 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 TEST_IGNORE_NODISCARD std::format(std::locale(), L"{:.42d}", 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 TEST_IGNORE_NODISCARD std::format(std::locale(), L"{:d}", 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#endif
93}
94

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