Typedef pointer to template function

The declarator becomes a new type. You can use typedef declarations to construct shorter or more meaningful names for types already defined by C or for types that you have declared.

Typedef names allow you to encapsulate implementation details that may change. A typedef declaration is interpreted in the same way as a variable or function declaration, but the identifier, instead of assuming the type specified by the declaration, becomes a synonym for the type.

Note that a typedef declaration does not create types. It creates synonyms for existing types, or names for types that could be specified in other ways. When a typedef name is used as a type specifier, it can be combined with certain type specifiers, but not others.

Acceptable modifiers include const and volatile. Typedef names share the name space with ordinary identifiers see Name Spaces for more information.

Therefore, a program can have a typedef name and a local-scope identifier by the same name. For example:. When declaring a local-scope identifier by the same name as a typedef, or when declaring a member of a structure or union in the same scope or in an inner scope, the type specifier must be specified.

This becomes more apparent when function pointers are used in more complex situations, such as arguments to functions. If you are using a function that takes a function pointer as a parameter without a function pointer type defined the function definition would be,.

Likewise functions can return function pointers and again, the use of a typedef can make the syntax simpler when doing so. The declaration for it from the C standard is:. That's a function that takes two arguments — an int and a pointer to a function which takes an int as an argument and returns nothing — and which returns a pointer to function like its second argument. Why is typedef used? To ease the reading of the code - especially for pointers to functions, or structure names.

The syntax looks odd in the pointer to function declaration That syntax is not obvious to read, at least when beginning. Using a typedef declaration instead eases the reading. Is a function pointer created to store the memory address of a function?

Yes, a function pointer stores the address of a function.