forked from mirror/libcxx
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// <streambuf>
|
|
|
|
// template <class charT, class traits = char_traits<charT> >
|
|
// class basic_streambuf;
|
|
|
|
// int_type sputbackc(char_type c);
|
|
|
|
#include <streambuf>
|
|
#include <cassert>
|
|
|
|
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()
|
|
{
|
|
{
|
|
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);
|
|
}
|
|
}
|