27.istream.getline.stdcxx-67.cpp

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#include <cassert>
#include <sstream>
 
int main ()
{
    std::istringstream strm ("\n\n");
 
    char s [3] = { 'x', 'y', 'z' };
 
    strm.getline (s, 0);
 
    // 27.6.1.3, p17, bullet 2:
    // Characters are extracted and stored until c == delim for the next
    // available input character c.
 
    assert (strm.goodbit == strm.rdstate ());
    assert (1 == strm.gcount ());
    assert ('x' == s [0]);
    assert ('y' == s [1]);
    assert ('z' == s [2]);
 
    strm.getline (s, 1);
 
    // 27.6.1.3, p17, bullet 3:
    // Characters are extracted and stored until (n - 1) characters
    // are stored (in which case the function calls setstate(failbit)).
    // p20:
    // In any case, it then stores a null character (using charT()) into
    // the next successive location of the array.
 
    assert (strm.goodbit == strm.rdstate ());
    assert (1 == strm.gcount ());
    assert ('\0' == s [0]);
    assert ('y' == s [1]);
    assert ('z' == s [2]);
 
    strm.clear ();
    strm.getline (s, 2);
 
    // 27.6.1.3, p17, bullet 1:
    // Characters are extracted and stored until end-of-file occurs on
    // the input sequence (in which case the function calls setstate(eofbit))
    // p20:
    // In any case, it then stores a null character (using charT()) into
    // the next successive location of the array.
 
    assert ((strm.eofbit | strm.failbit) == strm.rdstate ());
    assert (0 == strm.gcount ());
    assert ('\0' == s [0]);
    assert ('y' == s [1]);
    assert ('z' == s [2]);
 
    return 0;
}