Templates c. When template arguments are provided or for function and class since c17 templates only deduced they are substituted for the template parameters to obtain a specialization of the template that is a specific type or a specific function lvalue. However many data structures and algorithms look the same no matter what type they are operating on. A function template behaves like a function except that.
Just like regular function parameters can be used to pass values to a function template parameters allow to pass also types to a function. That is a custom. In simple terms you can create a single function or a class to work with different data types using templates.
The simple idea is to pass data type as a parameter so that we dont need to write same code for different data types. Template is simple and yet very powerful tool in c. A template parameter is a special kind of parameter that can be used to pass a type as argument.
There is a single definition of each container such as vector but we can define many different kinds. Templates are often used in larger codebase for the purpose of code reusability and flexibility of the programs. C does not allow non type template parameters such as template cint i.
A class template provides a specification for generating classes based on. As a strongly typed language c requires all variables to have a specific type either explicitly declared by the programmer or deduced by the compiler. A template is a blueprint or formula for creating a generic class or a function.
When a function or class is instantiated from a template. Rather than writing and maintaining the multiple codes. Templates are the basis for generic programming in c.
The following are the key differences between c generics and c templates. Templates are powerful features of c which allows you to write generic programs. For example a software company may need sort for different data types.
C generics do not provide the same amount of flexibility as c templates.