c++ - Constructor call when operator new failed -

c++ - Constructor call when operator new failed -

i’m trying implement technique test failing operator new described in http://www.codeproject.com/articles/6108/simulating-memory-allocation-failure-for-unit-test.

this sample code beingness tested:

varray* arr = new varray(1u, 3u, true);

i can create new homecoming null instead of allocating memory. in case, programme should go on next line (which should test if arr == null) , in msvc.

however, constructor of varray still called after failed new in gcc. , since this null, results in sigsegv on first assignment property. seems wrong behavior according c++03 standard: http://stackoverflow.com/a/11514528/711006

my implementation of operators new , delete follows.

unsigned int operatorplainnewfailsafter = uint_max; void* operator new(const size_t _size) throw() { void* result; if(operatorplainnewfailsafter == 0u) { result = null; } else { result = malloc(_size); operatorplainnewfailsafter--; } homecoming result; } void operator delete(void* _memory) throw() { free(_memory); }

what miss?

the c++ standard requires allocation function (e.g. basic operator new) fails throwing std::bad_alloc exception, if fails. it's not allowed homecoming nullpointer. when homecoming nullpointer have undefined behavior, , yes, 1 possible consequence constructor called.

c++ gcc c++03