You cannot initialize an array at compile-time if you are determining the size at run-time.
But depending on what you are trying to do, a non-const pointer to const data may provide you with what you're going for.
const char * pArray = new const char[determine_size()];
A more complete example:
int determine_size()
{
return 5;
}
const char * const allocate_a( int size )
{
char * data = new char[size];
for( int i=0; i<size; ++i )
data[i] = 'a';
return data;
}
int main()
{
const char * const pArray = allocate_a(determine_size());
//const char * const pArray = new char[determine_size()];
pArray[0] = 'b'; // compile error: read-only variable is not assignable
pArray = 0 ; // compile error: read-only variable is not assignable
delete[] pArray;
return 0;
}
I do agree with others that a std::vector is probably more what you're looking for. If you want it to behave more like your const array, you can assign it to a const reference.
#include <vector>
int main()
{
std::vector<char> data;
data.resize(5);
const std::vector<char> & pArray = data;
pArray[0] = 'b'; // compile error: read-only variable is not assignable
}