59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
#ifndef ARBUTILS_CONSTSTRING_HPP
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#define ARBUTILS_CONSTSTRING_HPP
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#include <cstddef>
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#include <cstdint>
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#include <cstring>
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#include <string>
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namespace Arbutils {
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class ConstString {
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private:
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const char* _str;
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size_t _length;
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uint32_t _hash;
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inline static uint32_t constexpr Hash(char const* input) {
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return (*input) ? static_cast<uint32_t>((*input)) + 33 * Hash(input + 1) : 5381;
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}
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inline static int constexpr Length(const char* str) { return *str ? 1 + Length(str + 1) : 0; }
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public:
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constexpr ConstString() : _str(""), _length(0), _hash(Hash("")){};
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constexpr explicit ConstString(const char* str) : _str(str), _length(Length(str)), _hash(Hash(str)){};
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constexpr explicit ConstString(const char* str, size_t size) : _str(str), _length(size), _hash(Hash(str)){};
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[[nodiscard]] inline constexpr const char* c_str() const noexcept { return _str; }
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[[nodiscard]] inline std::string std_str() const { return std::string(_str, _length); }
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[[nodiscard]] inline constexpr size_t Length() const noexcept { return _length; }
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[[nodiscard]] inline constexpr uint32_t GetHash() const noexcept { return _hash; }
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constexpr std::size_t operator()(ConstString const& s) const noexcept { return s.GetHash(); }
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inline constexpr operator uint32_t() const{ return _hash; }
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inline constexpr bool operator==(const ConstString& rhs) const{
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return _hash == rhs._hash;
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}
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inline constexpr bool operator!=(const ConstString& rhs) const{
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return _hash != rhs._hash;
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}
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};
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}
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inline constexpr Arbutils::ConstString operator"" _const(const char* c, size_t l) {
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return Arbutils::ConstString(c, l);
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}
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inline constexpr Arbutils::ConstString operator"" _c(const char* c, size_t l) {
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return Arbutils::ConstString(c, l);
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}
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namespace std {
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template <> struct hash<Arbutils::ConstString> {
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constexpr std::size_t operator()(Arbutils::ConstString const& s) const noexcept { return s.GetHash(); }
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};
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}
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#endif // ARBUTILS_CONSTSTRING_HPP
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