Why does new return null when using nothrow?

Why does new return null when using nothrow?

But when nothrow is used as argument for new, it returns a null pointer instead. The nothrow constant is a value of type nothrow_t, with the only purpose of triggering an overloaded version of the function operator new (or operator new []) that takes an argument of this type.

When to throw a bad _ alloc exception in nothrow?

By default, when the new operator is used to attempt 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.

Is there a way to remove the return are from a function?

There’s now only a single ‘if’ lacking an ‘else’, and it turns out even that can be removed by putting the “… more code here …” part into an else branch, and then the ‘return r;’ can be moved to the end of the function. The code is now comprehensible — it picks a register that is free and allowed, and preferred as well if possible.

But when nothrow is used as argument for new, it returns a null pointer instead. The nothrow constant is a value of type nothrow_t, with the only purpose of triggering an overloaded version of the function operator new (or operator new []) that takes an argument of this type.

By default, when the new operator is used to attempt 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.

When is it better to return NULL or empty?

null is the best thing to return if and only if the following following conditions apply: the null result is expected in normal operation. It could be expected that you may not be able to find a person in some reasonable circumstances, so findPerson () returning null is fine.

There’s now only a single ‘if’ lacking an ‘else’, and it turns out even that can be removed by putting the “… more code here …” part into an else branch, and then the ‘return r;’ can be moved to the end of the function. The code is now comprehensible — it picks a register that is free and allowed, and preferred as well if possible.