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16.1.5. Nontype Template Parameters
A template parameter need not be a type.
// initialize elements of an array to zero template <class T, size_t N> void array_init(T (&parm)[N]) { for (size_t i = 0; i != N; ++i) { parm[i] = 0; } }
A template nontype parameter is a constant value inside the template definition. A nontype parameter can be used when constant expressions are requiredfor example, as we do hereto specify the size of an array.
When array_initis called, the compiler figures out the value of the nontype parameter from the array argument:
int x[42]; double y[10]; array_init(x); // instantiates array_init(int(&)[42] array_init(y); // instantiates array_init(double(&)[10]
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