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 // libc++ supports basic_format_string in C++20 as an extension
12 // UNSUPPORTED: !stdlib=libc++ && c++20
13
14 // <format>
15
16 // template<class charT, class... Args>
17 // class basic_format_string<charT, type_identity_t<Args>...>
18 //
19 // template<class T> consteval basic_format_string(const T& s);
20 //
21 // This constructor does the compile-time format string validation for the
22 // std::format* functions.
23
24 #include <format>
25
26 #include <string_view>
27
28 #include "test_macros.h"
29
run()30 void run() {
31 (void)std::basic_format_string<char>{"foo"};
32 (void)std::basic_format_string<char>{"{}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
33 (void)std::basic_format_string<char, int>{"{0:{0}P}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
34 (void)std::basic_format_string<char, int>{"{0:{0}}"};
35 (void)std::basic_format_string<char, bool>{"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
36 (void)std::basic_format_string<char, int>{"{.3}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
37 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
38 (void)std::basic_format_string<wchar_t>{L"foo"};
39 (void)std::basic_format_string<wchar_t>{L"{}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
40 (void)std::basic_format_string<wchar_t, int>{L"{0:{0}P}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
41 (void)std::basic_format_string<wchar_t, int>{L"{0:{0}}"};
42 (void)std::basic_format_string<wchar_t, bool>{L"{0:{0}}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
43 (void)std::basic_format_string<wchar_t, int>{L"{.3}"}; // expected-error-re {{call to consteval function{{.*}}is not a constant expression}}
44 #endif
45 }
46