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//===----------------------------------------------------------------------===//
//
// 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 sgetc();
#include <streambuf>
#include <cassert>
int underflow_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 underflow()
{
++underflow_called;
return 'a';
}
};
int main()
{
{
test t;
assert(underflow_called == 0);
assert(t.sgetc() == 'a');
assert(underflow_called == 1);
char in[] = "ABC";
t.setg(in, in, in+sizeof(in));
assert(t.sgetc() == 'A');
assert(underflow_called == 1);
assert(t.sgetc() == 'A');
assert(underflow_called == 1);
}
}
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