21.string.stdcxx-231.cpp

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#include <cassert>
#include <string>
#include <sstream>
 
int main ()
{
    std::string s (100, 's');
 
    const std::string::size_type n = s.capacity ();
    const std::string::const_pointer p = s.c_str ();
 
    // verify getline(), clear(), erase() and replace() do not
    // unnecessarily resize or reallocate the data buffer
    std::istringstream is ("hello world");
    std::getline (is, s);
    assert (s.capacity () == n);
    assert (s.c_str ()    == p);
 
    s.clear ();
    assert (s.capacity () == n);
    assert (s.c_str ()    == p);
 
    s.erase ();
    assert (s.capacity () == n);
    assert (s.c_str ()    == p);
 
    s.replace (0, std::string::npos, "1", 0);
    assert (s.capacity () == n);
    assert (s.c_str ()    == p);
 
    return 0;
}