function to find length of 2d string array in cpp?

Question

Is there any inbuilt function in cpp that can give me the length of a 2d char array

for ex, the function for args

const char* args[] = {"412", "..7", ".58", "7.8", "32.", "6..", "351", "3.9", "985", "...", ".46"}

should return 11

Answer 1

I like to use a template function for this.

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

The advantage over an approach using sizeof is that you can't accidentally do it with a pointer.

Answer 2

这将给出args中元素的数量：

sizeof(args) / sizeof(args[0])

Answer 3

在C ++ 11中，您可以使用：

std::end(args) - std::begin(args)

Answer 4

sizeof(args) / sizeof(*args)