Problem Solving with C++ (10th Edition)
Problem Solving with C++ (10th Edition)
10th Edition
ISBN: 9780134448282
Author: Walter Savitch, Kenrick Mock
Publisher: PEARSON
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Chapter 17.1, Problem 6STE
Program Plan Intro

Function template:

In C++, a function template is referred as a “generic” function, which can work with different data types.

  • While writing a function template, a programmer should use a “type parameter” to denote a “generic” data type instead of using the actual parameter.
  • The compiler generates the code, when it encounters a function call to a function template. This code will handle the particular data type which is used in the function call.
  • The compiler identifies the argument type and generates the code to work with those types.
  • The generated code is referred as “template function”.

Example:

For example consider the following function template for finding a cube of value:

  template <class T>

  T cube(T x)

  {

  return x * x * x ;

  }

  • A function template must begin with the keyword “template” and it is followed by a pair of angle brackets, which contains one or more “generic” data types.
  • A “generic” type must start with the keyword “class”, followed by an argument name which stands for the data type.
  • The statement “T cube(T x)” is referred as function header, where “T” is a “type parameter”, “cube” is the function name and the variable “x” is declared for the type “T”.

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