27.stringbuf.str.stdcxx-514.cpp

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#include <sstream>  // for stringbuf
#include <memory>   // for allocator
 
#include <cassert>  // for assert()
 
char extbuf [3];
 
struct MyAlloc : std::allocator <char>
{
    pointer allocate (size_type __n, std::allocator<void>::const_pointer = 0) {
        return new char [__n];
    }
 
    void deallocate (pointer __p, size_type)
    {
        assert (extbuf != __p);
        delete [] __p;
    }
};
 
int main ()
{
    std::basic_stringbuf <char, std::char_traits <char>, MyAlloc> sbuf;
 
    sbuf.pubsetbuf (extbuf, sizeof (extbuf));
 
    const char* str = "abcdef";
    sbuf.str (str);
    assert (sbuf.str () == str);
 
    return 0;
}