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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <streambuf>
// template <class charT, class traits = char_traits<charT> >
// class basic_streambuf;
// int_type sputbackc(char_type c);
#include <streambuf>
#include <cassert>
#include "test_macros.h"
int pbackfail_called = 0;
struct test
: public std::basic_streambuf<char>
{
typedef std::basic_streambuf<char> base;
test() {}
void setg(char* gbeg, char* gnext, char* gend)
{
base::setg(gbeg, gnext, gend);
}
protected:
int_type pbackfail(int_type = traits_type::eof())
{
++pbackfail_called;
return 'a';
}
};
int main(int, char**)
{
{
test t;
assert(pbackfail_called == 0);
assert(t.sputbackc('A') == 'a');
assert(pbackfail_called == 1);
char in[] = "ABC";
t.setg(in, in+1, in+sizeof(in));
assert(t.sputbackc('A') == 'A');
assert(pbackfail_called == 1);
assert(t.sputbackc('A') == 'a');
assert(pbackfail_called == 2);
}
return 0;
}
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