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// <system_error>
10
11// class error_category
12
13// virtual string message(int ev) const = 0;
14
15#include <system_error>
16#include <cassert>
17#include <string>
18
19#include <stdio.h>
20
21#include "test_macros.h"
22
23int main(int, char**) {
24 const std::error_category& e_cat1 = std::generic_category();
25 const std::error_category& e_cat2 = std::system_category();
26 std::string m1 = e_cat1.message(5);
27 std::string m2 = e_cat2.message(5);
28 std::string m3 = e_cat2.message(6);
29 assert(!m1.empty());
30 assert(!m2.empty());
31 assert(!m3.empty());
32#ifndef _WIN32
33 // On windows, system_category is distinct.
34 LIBCPP_ASSERT(m1 == m2);
35#endif
36 assert(m2 != m3);
37
38 return 0;
39}
40

source code of libcxx/test/std/diagnostics/syserr/syserr.errcat/syserr.errcat.derived/message.pass.cpp