is_palind.hpp

// algocpp/string/is_palind.hpp
//
// This file is part of algocpp and is copyrighted by algocpp.
// If used, it must comply with the MIT License.

#ifndef ALGOCPP_STRING_ISPALIND
#define ALGOCPP_STRING_ISPALIND

#include <string>
#include <locale>
#include <algocpp/string/wconvert.hpp>

namespace algocpp
{
	namespace string
	{
		namespace base
		{
			template <typename T>
			inline bool base_is_palind(T s) noexcept
			{
				for (unsigned long long i = 0; i < (unsigned long long)(s.size() / 2); i++)
				{
					if (s[i] != s[s.size() - i - 1])
					{
						return false;
					}
				}
				return true;
			}
		}

		inline bool is_palind(std::u32string s) noexcept
		{
			return base::base_is_palind(s);
		}

		inline bool is_palind(std::string s) noexcept
		{
			return base::base_is_palind(s);
		}

		inline bool is_palind(std::u16string s) noexcept
		{
			return base::base_is_palind(s);
		}

		inline bool is_palind(std::wstring s) noexcept
		{
			return base::base_is_palind(s);
		}

// C++20
#if __cplusplus >= 202002LL
		inline bool is_palind(std::u8string s) noexcept
		{
			return base::base_is_palind(s);
		}
#endif
	}
}

#endif // ALGOCPP_STRING_ISPALIND