What is const return type C++?

If you say that a function’s return value is const: const int g(); you are promising that the original variable (inside the function frame) will not be modified. And again, because you’re returning it by value, it’s copied so the original value could never be modified via the return value.

Can a function return a const in C?

The language specifies that no const shall be specified on a function type. The language totally allows it on return types.

Should I return const reference?

You want to return a const reference when you return a property of an object, that you want not to be modified out-side of it. For example: when your object has a name, you can make following method const std::string& get_name(){ return name; }; . Which is most optimal way.

Is const a data type?

In the C, C++, D, JavaScript and Julia programming languages, const is a type qualifier: a keyword applied to a data type that indicates that the data is read only.

When should I use const C++?

The const keyword allows you to specify whether or not a variable is modifiable. You can use const to prevent modifications to variables and const pointers and const references prevent changing the data pointed to (or referenced).

How do you initialize a constant in C++?

To initialize the const value using constructor, we have to use the initialize list. This initializer list is used to initialize the data member of a class. The list of members, that will be initialized, will be present after the constructor after colon. members will be separated using comma.

Can a const function return a reference?

If the thing you are returning by reference is logically part of your this object, independent of whether it is physically embedded within your this object, then a const method needs to return by const reference or by value, but not by non-const reference.

Is const a data type in C?

Note that const variables must be initialized; otherwise there is no other way to assign them values….Const keyword in Dynamic C.

Const Example	Older Dynamic Behavior	Behavior in DC 10.64 and Later
auto const x = 10;	Error, auto const not allowed	x is stored on the stack but is not modifiable

Is a const a variable?

Constants are block-scoped, much like variables declared using the let keyword. The value of a constant can’t be changed through reassignment (i.e. by using the assignment operator), and it can’t be redeclared (i.e. through a variable declaration).

What is the benefit of using const in C++?

How do you initialize a const?

Should I always use const C++?

Yes, you should use const whenever possible. It makes a contract that your code will not change something. Remember, a non-const variable can be passed in to a function that accepts a const parameter. You can always add const, but not take it away (not without a const cast which is a really bad idea).

Why would you use const in C++?

The const keyword specifies that a variable’s value is constant and tells the compiler to prevent the programmer from modifying it. In C, constant values default to external linkage, so they can appear only in source files.

Does C++ return by value or reference?

C++ functions can return by value, by reference (but don’t return a local variable by reference), or by pointer (again, don’t return a local by pointer). When returning by value, the compiler can often do optimizations that make it equally as fast as returning by reference, without the problem of dangling references.

Does const make C++ faster?

No, const does not help the compiler make faster code. Const is for const-correctness, not optimizations.