1//===----------------------------------------------------------------------===//
2// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
3// See https://llvm.org/LICENSE.txt for license information.
4// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
5//
6//===----------------------------------------------------------------------===//
7
8// UNSUPPORTED: c++03, c++11, c++14, c++17
9
10// TODO FMT This test should not require std::to_chars(floating-point)
11// XFAIL: availability-fp_to_chars-missing
12
13// <format>
14
15// Basic test to validate ill-formed code is properly detected.
16
17// template<class Out, class... Args>
18// Out format_to(Out out, format-string<Args...> fmt, const Args&... args);
19// template<class Out, class... Args>
20// Out format_to(Out out, wformat-string<Args...> fmt, const Args&... args);
21
22#include <format>
23
24#include "test_macros.h"
25
26extern char* out;
27#ifndef TEST_HAS_NO_WIDE_CHARACTERS
28extern wchar_t* wout;
29#endif
30
31// clang-format off
32
33void f() {
34 std::format_to(out, "{"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
35 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
36
37 std::format_to(out, "}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
38 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
39
40 std::format_to(out, "{}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
41 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
42
43 std::format_to(out, "{0}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
44 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
45
46 std::format_to(out, "{:-}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
47 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
48
49 std::format_to(out, "{:#}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
50 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
51
52 std::format_to(out, "{:L}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
53 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
54
55 std::format_to(out, "{0:{0}}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
56 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
57
58 std::format_to(out, "{:.42d}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
59 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
60
61 std::format_to(out, "{:d}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
62 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
63
64#ifndef TEST_HAS_NO_WIDE_CHARACTERS
65 std::format_to(wout, L"{"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
66 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
67
68 std::format_to(wout, L"}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
69 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
70
71 std::format_to(wout, L"{}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
72 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
73
74 std::format_to(wout, L"{0}"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
75 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
76
77 std::format_to(wout, L"{:-}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
78 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
79
80 std::format_to(wout, L"{:#}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
81 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
82
83 std::format_to(wout, L"{:L}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
84 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
85
86 std::format_to(wout, L"{0:{0}}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
87 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
88
89 std::format_to(wout, L"{:.42d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
90 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
91
92 std::format_to(wout, L"{:d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
93 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
94#endif
95}
96

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