Count strings in string array c++?

Question

How to sum number of strings in string array in which is not explicit defined how many elements it takes?

string str[] = { "astring", "bstring", "cstring", "dstring", "zstring" };

Need to find out how many elements array have?

Answer 1

template< typename T, size_t N >
/*constexpr*/ size_t size( T(&arr)[N]) )
{
   return N;
}

constexpr if available (C++11) will allow you to use the return value for static (compile time) usage as a size of another array.

Answer 2

If str[] is statically defined (as shown), then this will work:

const size_t numElements = sizeof(str) / sizeof(str[0]);

If it's dynamically created, then you are going to need a marker to signal the last element (0 is being typically used if it's an array of pointers). Either that or the caller tells you how many elements there are (also common).