omallocClass.cc
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1 /****************************************
2 * Computer Algebra System SINGULAR *
3 ****************************************/
4 /*
5 * ABSTRACT: standard version of C++-memory management alloc func
6 */
7 
8 #ifdef __cplusplus
9 
10 #include <new>
11 #include <stdlib.h>
12 #include <omalloc/omallocClass.h>
13 
14 // The C++ standard has ratified a change to the new operator.
15 //
16 // T *p = new T;
17 //
18 // Previously, if the call to new above failed, a null pointer would've been returned.
19 // Under the ISO C++ Standard, an exception of type std::bad_alloc is thrown.
20 // It is possible to suppress this behaviour in favour of the old style
21 // by using the nothrow version.
22 //
23 // T *p = new (std::nothrow) T;
24 //
25 // So we have to overload this new also, just to be sure.
26 //
27 // A further interesting question is, if you don't have enough resources
28 // to allocate a request for memory,
29 // do you expect to have enough to be able to deal with it?
30 // Most operating systems will have slowed to be unusable
31 // long before the exception gets thrown.
32 
33 void * omallocClass::operator new(size_t size, const std::nothrow_t &) throw()
34 {
35  void* addr;
36  omTypeAlloc(void*, addr, size);
37  return addr;
38 }
39 
40 void * omallocClass::operator new[](size_t size, const std::nothrow_t &) throw()
41 {
42  void* addr;
43  if (size==(size_t)0) size = (size_t)1;
44  omTypeAlloc(void*, addr, size);
45  return addr;
46 }
47 #endif
int size(const CanonicalForm &f, const Variable &v)
int size ( const CanonicalForm & f, const Variable & v )
Definition: cf_ops.cc:600
#define omTypeAlloc(type, addr, size)
Definition: omAllocDecl.h:208