If a pointer is allocated with memory by the new operator and the allocation isn't successful, is it safe to set the pointer to nullptr in the catch block?
foo* var;
try {
var = new foo[size];
}
catch (std::bad_alloc& e) {
std::cout << "Error: " << e.what() << "\n";
var = nullptr;
}
An Alternate approach :
By default, when the new operator is used to allocate memory and the handling function is unable to do so, a bad_alloc exception is thrown. But when nothrow is used as argument for new, it returns a null pointer instead.
Therefore in your case you can also use the below syntax.
foo* var = new (std::nothrow) foo[size];
if (var == nullptr)
{
//allocation failed
}