• compiler replaces the call to an inline function with the code of the function itself, the overhead for setting the stage for a function call isn't necessary
• the size of compiled program increases

#ifndef CAR_H
#define CAR_H
#include <string>

class Car
{
	private:
		std::string model;
	public:
		std::string getModel() {return model;}
};

#endif
			

• Member functions defined in the declaration of a class are inline function by default

#ifndef CAR_H
#define CAR_H
#include <string>

class Car
{
	private:
		std::string model;
	public:
		std::string getModel();
};

inline std::string Car::getModel()
{
	return model;
}

#endif
			

• Inline functions should be put in the header file