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// Basic test to validate ill-formed code is properly detected.
15
16// <format>
17
18// template<class Out, class... Args>
19// format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
20// format-string<Args...> fmt, const Args&... args);
21// template<class Out, class... Args>
22// format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
23// wformat-string<Args...> fmt, const Args&... args);
24
25#include <format>
26
27#include "test_macros.h"
28
29extern char* out;
30#ifndef TEST_HAS_NO_WIDE_CHARACTERS
31extern wchar_t* wout;
32#endif
33
34// clang-format off
35
36void f() {
37 std::format_to_n(out, 42, "{"); // 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_n(out, 42, "}"); // 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_n(out, 42, "{}"); // 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_n(out, 42, "{0}"); // 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_n(out, 42, "{:-}", "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_n(out, 42, "{:#}", "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_n(out, 42, "{:L}", "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_n(out, 42, "{0:{0}}", "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_n(out, 42, "{:.42d}", "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 std::format_to_n(out, 42, "{:d}", "Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
65 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
66
67#ifndef TEST_HAS_NO_WIDE_CHARACTERS
68 std::format_to_n(wout, 42, 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_n(wout, 42, 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_n(wout, 42, L"{}"); // 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_n(wout, 42, L"{0}"); // 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_n(wout, 42, 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_n(wout, 42, 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_n(wout, 42, L"{:L}", 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_n(wout, 42, L"{0:{0}}", 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_n(wout, 42, L"{:.42d}", 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
95 std::format_to_n(wout, 42, L"{:d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
96 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
97#endif
98}
99

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