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C++ > Beginners Lab Assignments Code Examples

make your functions to be inline.

make your functions to be inline.

An inline function is a function in which body is inserted in the place of its call. These functions can be compared with Macros. Inline functions are used to improve performance of the application. However, many inline functions can lead your program to grow up in size. That is why often only small functions are declared as inline.

There are two ways to make your functions to be inline. The first one consists in simple definition of member function in the body of class declaration:

class Person
{
public:
	//an inline function
	string getFirstName()
	{
		return firstName;
	}
private:
	string firstName;
	string lastName;
	tm dateOfBirth;
};

getFirstName is an inline function in this case. 

 The use of inline functions has following advantages:

    The removing of some unnecessary instructions for function's call make programs faster.
    When many small functions are often called compiler generates more code for function's calls. The correct use of inline functions makes programs smaller.

Sometimes it seems that inline functions can increase performance of an application. However, the use of many inline functions can cause different problems:

    Many inline functions can cause the growth of binary executable file.
    Inline function must be declared in every compilation unit where it is used.

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