21.string.io.stdcxx-206.cpp

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#include <strstream>
#include <string>
#include <cassert>
 
void test (const std::string& str, const std::streamsize width)
{
    enum { bufsize = 10 };
    char buf[bufsize];
    std::ostrstream os (buf, bufsize);
 
    os.width (width);
    os.exceptions (std::ios_base::failbit | std::ios_base::badbit);
 
    try {
        os << str;
    }
    catch (std::ios_base::failure&) {
    }
 
#ifndef _RWSTD_NO_EXT_KEEP_WIDTH_ON_FAILURE
    assert (width == os.width ());
#else
    assert (0 == os.width ());
#endif
}
 
int main ()
{
    std::string str ("abcdefghijk");
 
    test (str, 2);
    test (str, str.size () + 2);
 
    return 0;
}