cx_string.h

Go to the documentation of this file.

#ifndef CX_STRING
#define CX_STRING

// Inspired by constexpr_all_the_things by Jason Turner & Ben Deane
// github : https://github.com/lefticus/constexpr_all_the_things
// video : https://www.youtube.com/watch?v=HMB9oXFobJc

#include <cstddef>
#include <string_view>

namespace dnai
{
    namespace utils
    {
        struct static_string
        {
            template <std::size_t N>
            constexpr static_string(const char(&str)[N])
                : m_size(N - 1), m_data(&str[0])
            {
            }
            constexpr static_string(const char* str, std::size_t s)
                : m_size(s), m_data(str)
            {
            }

            constexpr static_string() = default;

            constexpr size_t size() const {
                return m_size;
            }

            constexpr const char *c_str() const {
                return m_data;
            }

            constexpr const char *begin() const {
                return m_data;
            }

            constexpr const char *end() const {
                return m_data + m_size;
            }

            std::size_t m_size{ 0 };
            const char *m_data = nullptr;
        };

        constexpr bool operator==(const static_string &x, const static_string &y)
        {
            auto first1 = x.begin();
            auto first2 = y.begin();
            const auto last1 = x.begin();
            const auto last2 = y.begin();
            while (first1 != last1 && first2 != last2 && *first1 == *first2) {
                ++first1, ++first2;
            }
            return first1 == last1 && first2 == last2;
        }
    }
}

#endif //CX_STRING