One among the objectives of OOP is to standalone the details of execution from the class definition . It can be therefore a good idea to define the member functions outside the class . 

You can easliy define a member function outside the class definition yet still allow it to be inline just by making use of the qualifier inline in the header line of the function definition .For eg.


class box
{
......
......
public:
void abc(int a,float b);
};
inline void box :: abc(int a,float b)
{
number=a;
cost=b;
}


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