If you mean a C-style array, then you can do something like:
int a[7]; std::cout << "Length of array = " << (sizeof(a)/sizeof(*a)) << std::endl;
This doesn’t work on pointers (i.e. it won’t work for either of the following):
int *p = new int[7]; std::cout << "Length of array = " << (sizeof(p)/sizeof(*p)) << std::endl;
or:
void func(int *p) { std::cout << "Length of array = " << (sizeof(p)/sizeof(*p)) << std::endl; } int a[7]; func(a);
In C++, if you want this kind of behavior, then you should be using a container class; probably std::vector
.
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