#include <iterator>
#include <sstream>
#include <cassert>
int main()
{
{
std::istringstream inf1("abc");
std::istringstream inf2("def");
std::istreambuf_iterator<char> i1(inf1);
std::istreambuf_iterator<char> i2(inf2);
std::istreambuf_iterator<char> i3;
std::istreambuf_iterator<char> i4;
assert( i1.equal(i1));
assert( i1.equal(i2));
assert(!i1.equal(i3));
assert(!i1.equal(i4));
assert( i2.equal(i1));
assert( i2.equal(i2));
assert(!i2.equal(i3));
assert(!i2.equal(i4));
assert(!i3.equal(i1));
assert(!i3.equal(i2));
assert( i3.equal(i3));
assert( i3.equal(i4));
assert(!i4.equal(i1));
assert(!i4.equal(i2));
assert( i4.equal(i3));
assert( i4.equal(i4));
}
{
std::wistringstream inf1(L"abc");
std::wistringstream inf2(L"def");
std::istreambuf_iterator<wchar_t> i1(inf1);
std::istreambuf_iterator<wchar_t> i2(inf2);
std::istreambuf_iterator<wchar_t> i3;
std::istreambuf_iterator<wchar_t> i4;
assert( i1.equal(i1));
assert( i1.equal(i2));
assert(!i1.equal(i3));
assert(!i1.equal(i4));
assert( i2.equal(i1));
assert( i2.equal(i2));
assert(!i2.equal(i3));
assert(!i2.equal(i4));
assert(!i3.equal(i1));
assert(!i3.equal(i2));
assert( i3.equal(i3));
assert( i3.equal(i4));
assert(!i4.equal(i1));
assert(!i4.equal(i2));
assert( i4.equal(i3));
assert( i4.equal(i4));
}
}