//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <ostream>
// template <class charT, class traits = char_traits<charT> >
// class basic_ostream;
// operator<<(unsigned long val);
#include <ostream>
#include <cassert>
#include "test_macros.h"
template <class CharT>
class testbuf
: public std::basic_streambuf<CharT>
{
typedef std::basic_streambuf<CharT> base;
std::basic_string<CharT> str_;
public:
testbuf()
{
}
std::basic_string<CharT> str() const
{return std::basic_string<CharT>(base::pbase(), base::pptr());}
protected:
virtual typename base::int_type
overflow(typename base::int_type ch = base::traits_type::eof())
{
if (ch != base::traits_type::eof())
{
int n = static_cast<int>(str_.size());
str_.push_back(static_cast<CharT>(ch));
str_.resize(str_.capacity());
base::setp(const_cast<CharT*>(str_.data()),
const_cast<CharT*>(str_.data() + str_.size()));
base::pbump(n+1);
}
return ch;
}
};
int main(int, char**)
{
{
std::ostream os((std::streambuf*)0);
unsigned long n = 0;
os << n;
assert(os.bad());
assert(os.fail());
}
{
testbuf<char> sb;
std::ostream os(&sb);
unsigned long n = 0;
os << n;
assert(sb.str() == "0");
}
{
testbuf<char> sb;
std::ostream os(&sb);
unsigned long n = 10;
os << n;
assert(sb.str() == "10");
}
{
testbuf<char> sb;
std::ostream os(&sb);
std::hex(os);
unsigned long n = 0xfffffff6;
os << n;
assert(sb.str() == "fffffff6");
}
return 0;
}