ChaiScript/include/chaiscript/utility/static_string.hpp

// This file is distributed under the BSD License.
// See "license.txt" for details.
// Copyright 2009-2012, Jonathan Turner (jonathan@emptycrate.com)
// Copyright 2009-2018, Jason Turner (jason@emptycrate.com)
// http://www.chaiscript.com

#ifndef CHAISCRIPT_UTILITY_STATIC_STRING_HPP_
#define CHAISCRIPT_UTILITY_STATIC_STRING_HPP_

namespace chaiscript::utility {
  struct Static_String {
    template<size_t N>
    constexpr Static_String(const char (&str)[N]) noexcept
        : m_size(N - 1)
        , data(&str[0]) {
    }

    constexpr size_t size() const noexcept { return m_size; }

    constexpr const char *c_str() const noexcept { return data; }

    constexpr auto begin() const noexcept { return data; }

    constexpr auto end() const noexcept { return data + m_size; }

    constexpr bool operator==(std::string_view other) const noexcept {
      // return std::string_view(data, m_size) == other;
      auto b1 = begin();
      const auto e1 = end();
      auto b2 = other.begin();
      const auto e2 = other.end();

      if (e1 - b1 != e2 - b2) {
        return false;
      }

      while (b1 != e1) {
        if (*b1 != *b2) {
          return false;
        }
        ++b1;
        ++b2;
      }
      return true;
    }

    bool operator==(const std::string &t_str) const noexcept { return std::equal(begin(), end(), std::cbegin(t_str), std::cend(t_str)); }

    const size_t m_size;
    const char *data = nullptr;
  };
} // namespace chaiscript::utility

#endif