C++ template parameter in array dimension

Question

I have have the following code using templates and array dimension as template non-type parameter

template<int n> double f(double c[n]);
...
double c[5];
f<5>(c);  // compiles
f(c);  // does not compile

should not the compiler to be able to instantiate the second f without explicit template parameter? I am using g++4.1

Answer 1

It works when using references:

template<size_t n> double f(double (&c)[n]);