For Auto const

"For auto const" is a C++11 feature that allows automatic type deduction for a constant variable. It is simply a combination of two keywords "auto" and "const".

When we declare a variable using "auto const", the compiler deduces the type of the variable at compile time and ensures that it cannot be modified later. This provides the benefits of type safety and immutability.

For example, consider the following code:

auto const x = 10;

Here, the type of the variable "x" is deduced as "const int" by the compiler, and it is ensured that "x" cannot be modified later in the program.

The "auto const" feature is especially useful when dealing with complex types like iterators, where the type declaration can be lengthy and error-prone. By using "auto const", we can avoid the hassle of typing out the full type name and still ensure type safety and immutability.