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
27extern char* out;
28#ifndef TEST_HAS_NO_WIDE_CHARACTERS
29extern wchar_t* wout;
30#endif
31
32// clang-format off
33
34void 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}
97

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