OPERATOR_NEW_PLACEMENT.cpp

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// checking for operator new (size_t, void*)
 
 
#include "config.h"
 
#include <stddef.h>
 
#ifdef _RWSTD_NO_EXCEPTION_SPECIFICATION
#  define throw()
#endif   // _RWSTD_NO_EXCEPTION_SPECIFICATION
 
#ifndef _RWSTD_NO_HONOR_STD
#  ifdef _RWSTD_NO_STD_TERMINATE
#    include "terminate.h"
#  endif   // _RWSTD_NO_STD_TERMINATE
#endif   // _RWSTD_NO_HONOR_STD
 
 
void* operator new (size_t, void*) throw ();
 
void* foo (size_t n, void *p) throw () { return ::operator new (n, p); }
 
void* (*operator_new)(size_t, void*);
 
 
struct S {
    char c_;
    char d_;
 
    S (): c_ (0), d_ (0) { }
 
    S (char c): c_ (c), d_ (0) { }
 
    S (char c, char d): c_ (c), d_ (d) { }
};
 
 
int main (int argc, char *argv[])
{
    (void)&argv;
 
    int result = 0;
 
    char buf [sizeof (S) + 32];
 
    void *p0 = buf;
 
    void *p1 = ::operator new (sizeof (S), p0);
 
    if (p1 != p0)
        result = result << 1 + 1;
 
    if (argc > 1)
        operator_new = &operator new;
    else
        operator_new = &foo;
 
    p1 = operator_new (sizeof (S), p0);
 
    if (p1 != p0)
        result = (result << 1) + 1;
 
    S *s = new (p0) S ();
 
    if (p1 != p0)
        result = (result << 1) + 1;
 
    if (s->c_ != '\0' || s->d_ != '\0')
        result = (result << 1) + 1;
 
    s = new (p0) S ('x');
 
    if (s->c_ != 'x' || s->d_ != '\0')
        result = (result << 1) + 1;
 
    s = new (p0) S ('y', 'z');
 
    if (s->c_ != 'c' || s->d_ != 'z')
        result = (result << 1) + 1;
 
    // prevent compilers from optimizing the code above away
    // without actually ever using the result (unless the
    // test is invoked with command line arguments)
    if (argc > 1)
        return result;
 
    return 0;
}