CaseInsensitiveMultimap.hpp

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#pragma once
#ifndef _KURLYK_UTILS_CASE_INSENSITIVE_MULTIMAP_HPP_INCLUDED
#define _KURLYK_UTILS_CASE_INSENSITIVE_MULTIMAP_HPP_INCLUDED

 
namespace kurlyk::utils {

    inline bool case_insensitive_equal(const std::string& str1, const std::string& str2) noexcept {
        return str1.size() == str2.size() &&
               std::equal(str1.begin(), str1.end(), str2.begin(), [](char a, char b) {
                   return tolower(a) == tolower(b);
               });
    }

    class CaseInsensitiveEqual {
    public:
        bool operator()(const std::string& str1, const std::string& str2) const noexcept {
            return case_insensitive_equal(str1, str2);
        }
    };

    class CaseInsensitiveHash {
    public:
        std::size_t operator()(const std::string& str) const noexcept {
            std::size_t h = 0;
            std::hash<int> hash;
            for (auto c : str) {
                h ^= hash(tolower(c)) + 0x9e3779b9 + (h << 6) + (h >> 2);
            }
            return h;
        }
    };

    using CaseInsensitiveMultimap = std::unordered_multimap<std::string, std::string, CaseInsensitiveHash, CaseInsensitiveEqual>;
    
    using CaseInsensitiveCookieMultimap = std::unordered_multimap<std::string, Cookie, CaseInsensitiveHash, CaseInsensitiveEqual>;
 
} // namespace kurlyk::utils
 
namespace kurlyk {

    using Headers = utils::CaseInsensitiveMultimap;

    using QueryParams = utils::CaseInsensitiveMultimap;

    using Cookies = utils::CaseInsensitiveCookieMultimap;
 
} // namespace kurlyk
 
#endif // _KURLYK_UTILS_CASE_INSENSITIVE_MULTIMAP_HPP_INCLUDED