Cannot use .begin() or .end() on an array

Question

The error reads:

request for member \'begin\', \'end\' in \'arr\' which is non class type int[5], unable to deduce from expression error.

Answer 1

Arrays have no member functions as they aren't a class type. This is what the error is saying.

You can use std::begin(arr) and std::end(arr) from the header instead. This also works with types that do have .begin() and .end() members, via overloading:

#include 
#include 

#include 

int main()
{
    int c_array[5] = {};
    std::array cpp_array = {};
    std::vector cpp_dynarray(5);

    auto c_array_begin = std::begin(c_array); // = c_array + 0
    auto c_array_end = std::end(c_array);     // = c_array + 5

    auto cpp_array_begin = std::begin(cpp_array); // = cpp_array.begin()
    auto cpp_array_end = std::end(cpp_array);     // = cpp_array.end()

    auto cpp_dynarray_begin = std::begin(cpp_dynarray); // = cpp_dynarray.begin()
    auto cpp_dynarray_end = std::end(cpp_dynarray);     // = cpp_dynarray.end()
}