Is nullptr same as null in C++?

nullptr is a new keyword introduced in C++11. nullptr is meant as a replacement to NULL . nullptr provides a typesafe pointer value representing an empty (null) pointer. The general rule of thumb that I recommend is that you should start using nullptr whenever you would have used NULL in the past.

What does nullptr mean in C++?

null pointer value
The nullptr keyword represents a null pointer value. Use a null pointer value to indicate that an object handle, interior pointer, or native pointer type does not point to an object.

Can you use 0 instead of nullptr?

NULL is allowed to expand to any null pointer constant, so it could be 0 , 0L (etc.) or nullptr , but (again) cannot be any non-zero integer, nor can it have type “pointer to void” (or “pointer to char”, etc.) The intent, however, has always been that NULL only be used to represent a null pointer.

Is null and nullptr same?

Nullptr vs NULL NULL is 0 (zero) i.e. integer constant zero with C-style typecast to void* , while nullptr is prvalue of type nullptr_t , which is an integer literal that evaluates to zero.

Can you return nullptr in C++?

Answer #1: Value of return type std::vector cannot be nullptr . The most straightforward way in this case is to return std::unique_ptr> instead – in this case it’s possible to return nullptr .

Is nullptr same as null?

Where does nullptr point to?

As Null pointer always points to null, one would think that Pointer to a Null Pointer is invalid and won’t be compiled by the compiler. But it is not the case.

How do you write null in CPP?

The C and C++ languages have a null character (NUL), a null pointer (NULL), and a null statement (just a semicolon (;)). The C NUL is a single character that compares equal to 0. The C NULL is a special reserved pointer value that does not point to any valid data object.

Is Nullptr false?

A zero value, null pointer value, or null member pointer value is converted to false; any other value is converted to true.

Is nullptr false in C++?

Does nullptr evaluate to false?

It is non-zero, it’s true. A null pointer is zero, and so evaluates to false.

Is nullptr a literal?

nullptr is a pointer literal of type std::nullptr_t , and it’s a prvalue (you cannot take the address of it using & ).