c++ - Computing length of array

Question

I have a C++ array declared as mentioned below:

CString carray[] =
{
        "A",
        "B",
        "C",
        "D",
        "E"
}

I want to determine the length of carray at runtime. I am doing:

int iLength = sizeof(carray)/sizeof(CString);

Is this correct?

Answer 1

You can use the following function template. If you're using Boost, you can call boost::size.

template <typename T, std::size_t N>
std::size_t size(T (&)[N])
{
    return N;
}

int iLength = size(carray);

As others have already stated, however, you should prefer std::vector to C-style arrays.