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Code written in-place is significantly faster , so C++ offers a way to combine the advantages of functions 

with the speed of code written in-place: inline functions.


for example :

inline int min(int nX, int nY)
{
    return nX > nY ? nY : nX;
}

int main()
{
    using namespace std;
    cout << (5 > 6 ? 6 : 5) << endl;
    cout << (3 > 2 ? 2 : 3) << endl;
    return 0;
}


ref : http://www.learncpp.com/cpp-tutorial/75-inline-functions/

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