A member function of a class template may be defined outside of the class template definition in which it is declared. [ Example:
template<class T> class Array {
T* v;
int sz;
public:
explicit Array(int);
T& operator[](int);
T& elem(int i) { return v[i]; }
};
declares three function templates. The subscript function might be defined like this:
template<class T> T& Array<T>::operator[](int i) {
if (i<0 || sz<=i) error("Array: range error");
return v[i];
}
— end example ]
The template-arguments for a member function of a class template are determined by the template-arguments of the type of the object for which the member function is called. [ Example: the template-argument for Array<T> :: operator [] () will be determined by the Array to which the subscripting operation is applied.
Array<int> v1(20); Array<dcomplex> v2(30); v1[3] = 7; v2[3] = dcomplex(7,8);
— end example ]
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