hash_string.h

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// SPDX-License-Identifier: MIT
 
#ifndef TASKOLIB_CASE_STRING_H_
#define TASKOLIB_CASE_STRING_H_
 
#include <gul14/string_view.h>
 
namespace task {
 
inline constexpr unsigned long hash_djb2a(gul14::string_view sv) {
    unsigned long hash{ 5381 };
    for (unsigned char c : sv) {
        hash = ((hash << 5) + hash) ^ c;
    }
    return hash;
}
 
inline constexpr unsigned long operator"" _sh(const char *str, std::size_t len) {
    return hash_djb2a(gul14::string_view{ str, len });
}
 
} // namespace task
 
#endif