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The signature of a function template contains the name, parameter-type-list, return type, trailing requires-clause (if any) (since C++20), and signature of the template-head. Except for the following cases, its signature also contains the enclosing namespace.
Templates are a powerful feature in C++ that allows for the creation of generic functions and classes. They provide a way to write code that works with different data types without sacrificing type safety.
In this tutorial, we will learn about function templates in C++ with the help of examples. We can create a single function to work with different data types by using a template.
A function template is a function-like definition that is used to generate one or more overloaded functions, each with a different set of actual types. This is what will allow us to create functions that can work with many different types.
In order for a template to be instantiated, every template parameter (type, non-type, or template) must be replaced by a corresponding template argument. For class templates, the arguments are either explicitly provided, deduced from the initializer, (since C++17) or defaulted.
To create a template function in C++, we use the template keyword followed by the typename keyword (or class keyword) and a placeholder for the type. Syntax of Function Template. template<typename T> returnType functionName(T parameter1, T parameter2, ...) // Body of the function . } where: template: This keyword can be used to declare the template
A template is a C++ entity that defines one of the following: a family of classes (class template), which may be nested classes. a family of functions (function template), which may be member functions. an alias to a family of types (alias template) (since C++11) a family of variables (variable template)