87 lines
1.5 KiB
C++
87 lines
1.5 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 1997, Microsoft Corp. All rights reserved.
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//
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// FILE
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//
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// newop.cpp
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//
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// SYNOPSIS
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//
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// Implmentation of the global new and delete operators.
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//
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// MODIFICATION HISTORY
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//
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// 08/19/1997 Original version.
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _NEWOP_CPP_
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#define _NEWOP_CPP_
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#include <cstdlib>
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#include <new>
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//////////
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// CRT function that calls the new handler directly.
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//////////
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extern "C" int __cdecl _callnewh(size_t);
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//////////
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// Standard new operator.
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//////////
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void* __cdecl operator new(size_t size) throw (std::bad_alloc)
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{
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void* p;
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// Loop until either we get the memory or the new handler fails.
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while ((p = malloc(size)) == 0)
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{
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if (!_callnewh(size))
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{
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throw std::bad_alloc();
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}
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}
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return p;
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}
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//////////
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// "No throw" version of the new operator.
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//////////
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void* __cdecl operator new(size_t size, const std::nothrow_t&) throw ()
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{
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void* p;
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// Loop until either we get the memory or the new handler fails.
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while ((p = malloc(size)) == 0)
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{
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if (!_callnewh(size))
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{
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return 0;
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}
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}
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return p;
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}
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//////////
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// Delete operator.
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//////////
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void __cdecl operator delete(void *p) throw()
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{
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#ifdef DEBUG
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// Clobber the memory.
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if (p) memset(p, 0xA3, _msize(p));
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#endif
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// The MSVC free() handles null pointers, so we don't have to check.
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free(p);
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}
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#endif // _NEWOP_CPP_
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