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 // UNSUPPORTED: no-localization
10 // UNSUPPORTED: libcpp-has-no-incomplete-format
11 // TODO FMT Evaluate gcc-12 status
12 // UNSUPPORTED: gcc-12
13 // TODO FMT Investigate AppleClang ICE
14 // UNSUPPORTED: apple-clang-13
15
16 // <format>
17
18 // template<class Out, class... Args>
19 // Out format_to(Out out, const locale& loc,
20 // format-string<Args...> fmt, const Args&... args);
21 // template<class Out, class... Args>
22 // Out format_to(Out out, const locale& loc,
23 // wformat-string<Args...> fmt, const Args&... args);
24
25 #include <format>
26 #include <algorithm>
27 #include <cassert>
28 #include <list>
29 #include <vector>
30
31 #include "test_macros.h"
32 #include "format_tests.h"
33 #include "string_literal.h"
34
35 auto test = []<string_literal fmt, class CharT, class... Args>(std::basic_string_view<CharT> expected,
36 const Args&... args) constexpr {
37 {
38 std::basic_string<CharT> out(expected.size(), CharT(' '));
39 auto it = std::format_to(out.begin(), std::locale(), fmt.template sv<CharT>(), args...);
40 assert(it == out.end());
41 assert(out == expected);
42 }
43 {
44 std::list<CharT> out;
45 std::format_to(std::back_inserter(out), std::locale(), fmt.template sv<CharT>(), args...);
46 assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end()));
47 }
48 {
49 std::vector<CharT> out;
50 std::format_to(std::back_inserter(out), std::locale(), fmt.template sv<CharT>(), args...);
51 assert(std::equal(out.begin(), out.end(), expected.begin(), expected.end()));
52 }
53 {
54 assert(expected.size() < 4096 && "Update the size of the buffer.");
55 CharT out[4096];
56 CharT* it = std::format_to(out, std::locale(), fmt.template sv<CharT>(), args...);
57 assert(std::distance(out, it) == int(expected.size()));
58 // Convert to std::string since output contains '\0' for boolean tests.
59 assert(std::basic_string<CharT>(out, it) == expected);
60 }
61 };
62
63 auto test_exception = []<class CharT, class... Args>(std::string_view, std::basic_string_view<CharT>, const Args&...) {
64 // After P2216 most exceptions thrown by std::format_to become ill-formed.
65 // Therefore this tests does nothing.
66 // A basic ill-formed test is done in format_to.locale.verify.cpp
67 // The exceptions are tested by other functions that don't use the basic-format-string as fmt argument.
68 };
69
main(int,char **)70 int main(int, char**) {
71 format_tests<char>(test, test_exception);
72
73 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
74 format_tests_char_to_wchar_t(test);
75 format_tests<wchar_t>(test, test_exception);
76 #endif
77
78 return 0;
79 }
80