range_access.h

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#pragma once
 
#include "fl/stdint.h"
 
namespace fl {
 
// fl::begin for arrays
template <typename T, size_t N>
constexpr T* begin(T (&array)[N]) noexcept {
    return array;
}
 
// fl::end for arrays
template <typename T, size_t N>
constexpr T* end(T (&array)[N]) noexcept {
    return array + N;
}
 
// fl::begin for containers with begin() member function
template <typename Container>
constexpr auto begin(Container& c) -> decltype(c.begin()) {
    return c.begin();
}
 
// fl::begin for const containers with begin() member function
template <typename Container>
constexpr auto begin(const Container& c) -> decltype(c.begin()) {
    return c.begin();
}
 
// fl::end for containers with end() member function
template <typename Container>
constexpr auto end(Container& c) -> decltype(c.end()) {
    return c.end();
}
 
// fl::end for const containers with end() member function
template <typename Container>
constexpr auto end(const Container& c) -> decltype(c.end()) {
    return c.end();
}
 
} // namespace fl