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// format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
21// const locale& loc, format-string<Args...> fmt,
22// const Args&... args);
23// template<class Out, class... Args>
24// format_to_n_result<Out> format_to_n(Out out, iter_difference_t<Out> n,
25// const locale& loc, wformat-string<Args...> fmt,
26// const Args&... args);
27
28#include <format>
29#include <locale>
30
31#include "test_macros.h"
32
33extern char* out;
34#ifndef TEST_HAS_NO_WIDE_CHARACTERS
35extern wchar_t* wout;
36#endif
37
38// clang-format off
39
40void f() {
41 std::format_to_n(out, 42, std::locale(), "{"); // 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_n(out, 42, std::locale(), "}"); // 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_n(out, 42, std::locale(), "{}"); // 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_n(out, 42, std::locale(), "{0}"); // 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_n(out, 42, std::locale(), "{:-}", "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_n(out, 42, std::locale(), "{:#}", "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_n(out, 42, std::locale(), "{:L}", "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_n(out, 42, std::locale(), "{0:{0}}", "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 std::format_to_n(out, 42, std::locale(), "{:.42d}", "Forty-two"); // 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_n(out, 42, std::locale(), "{:d}", "Forty-two"); // 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#ifndef TEST_HAS_NO_WIDE_CHARACTERS
72 std::format_to_n(wout, 42, std::locale(), 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_n(wout, 42, std::locale(), L"}"); // 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_n(wout, 42, std::locale(), L"{}"); // 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_n(wout, 42, std::locale(), L"{0}"); // 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_n(wout, 42, std::locale(), 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_n(wout, 42, std::locale(), L"{:#}", 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_n(wout, 42, std::locale(), L"{:L}", 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_n(wout, 42, std::locale(), L"{0:{0}}", 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
96 std::format_to_n(wout, 42, std::locale(), L"{:.42d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
97 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
98
99 std::format_to_n(wout, 42, std::locale(), L"{:d}", L"Forty-two"); // expected-error-re{{call to consteval function '{{.*}}' is not a constant expression}}
100 // expected-note@*:* {{non-constexpr function '__throw_format_error' cannot be used in a constant expression}}
101#endif
102}
103

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