#include <sstream>
#include <cassert>
int main()
{
{
std::ostringstream ss(" 123 456");
assert(ss.rdbuf() != 0);
assert(ss.good());
assert(ss.str() == " 123 456");
int i = 0;
ss << i;
assert(ss.str() == "0123 456");
ss << 456;
assert(ss.str() == "0456 456");
ss.str(" 789");
assert(ss.str() == " 789");
ss << "abc";
assert(ss.str() == "abc9");
}
{
std::wostringstream ss(L" 123 456");
assert(ss.rdbuf() != 0);
assert(ss.good());
assert(ss.str() == L" 123 456");
int i = 0;
ss << i;
assert(ss.str() == L"0123 456");
ss << 456;
assert(ss.str() == L"0456 456");
ss.str(L" 789");
assert(ss.str() == L" 789");
ss << L"abc";
assert(ss.str() == L"abc9");
}
}