mmalloc.cc

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/****************************************
*  Computer Algebra System SINGULAR     *
****************************************/
/*
* ABSTRACT: standard version of C++-memory management alloc func
*/
#include <kernel/mod2.h>

#include <omalloc/omalloc.h>

#include <new>
#include <stdlib.h>

/* We define those, so that our values of
   OM_TRACK and OM_CHECK are used  */
void* operator new ( size_t size )
#ifndef __GNUC__
throw (std::bad_alloc)
#endif
{
  void* addr;
  if (size==(size_t)0) size = 1;
  omTypeAlloc(void*, addr, size);
  return addr;
}

void operator delete ( void* block )
#ifndef __GNUC__
throw ()
#endif
{
  omfree( block );
}

void* operator new[] ( size_t size )
#ifndef __GNUC__
throw (std::bad_alloc)
#endif
{
  void* addr;
  if (size==(size_t)0) size = (size_t)1;
  omTypeAlloc(void*, addr, size);
  return addr;
}

void operator delete[] ( void* block )
#ifndef __GNUC__
throw ()
#endif
{
  omfree( block );
}

// The C++ standard has ratified a change to the new operator.
//
//  T *p = new T;
//
// Previously, if the call to new above failed, a null pointer would've been returned.
// Under the ISO C++ Standard, an exception of type std::bad_alloc is thrown.
// It is possible to suppress this behaviour in favour of the old style
// by using the nothrow version.
//
//  T *p = new (std::nothrow) T;
//
// So we have to overload this new also, just to be sure.
//
// A further interesting question is, if you don't have enough resources
// to allocate a request for memory,
// do you expect to have enough to be able to deal with it?
// Most operating systems will have slowed to be unusable
// long before the exception gets thrown.

void * operator new(size_t size, const std::nothrow_t &) throw()
{
  void* addr;
  if (size==(size_t)0) size = (size_t)1;
  omTypeAlloc(void*, addr, size);
  return addr;
}

void * operator new[](size_t size, const std::nothrow_t &) throw()
{
  void* addr;
  if (size==(size_t)0) size = (size_t)1;
  omTypeAlloc(void*, addr, size);
  return addr;
}