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Better handling of ConstString types.
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This commit is contained in:
Deukhoofd 2020-02-27 17:22:06 +01:00
parent 09b6fd92ce
commit aacca6e5e2
Signed by: Deukhoofd
GPG Key ID: ADF2E9256009EDCE
4 changed files with 78 additions and 116 deletions
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66
src/CaseInsensitiveConstString.hpp
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@ -1,66 +0,0 @@
#ifndef ARBUTILS_CASEINSENSITIVECONSTSTRING_HPP
#define ARBUTILS_CASEINSENSITIVECONSTSTRING_HPP
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <string>
namespace Arbutils {
class CaseInsensitiveConstString {
private:
const char* _str;
size_t _length;
uint32_t _hash;
inline static constexpr char charToLower(const char c) { return (c >= 'A' && c <= 'Z') ? c + ('a' - 'A') : c; }
inline static uint32_t constexpr Hash(char const* input) {
return charToLower(*input) ? static_cast<uint32_t>(charToLower(*input)) + 33 * Hash(input + 1) : 5381;
}
inline static int constexpr Length(const char* str) { return *str ? 1 + Length(str + 1) : 0; }
public:
constexpr CaseInsensitiveConstString() : _str(""), _length(0), _hash(Hash("")){};
constexpr explicit CaseInsensitiveConstString(const char* str)
: _str(str), _length(Length(str)), _hash(Hash(str)){};
constexpr explicit CaseInsensitiveConstString(const std::string& str)
: _str(str.c_str()), _length(str.length()), _hash(Hash(str.c_str())){};
constexpr explicit CaseInsensitiveConstString(const char* str, size_t size)
: _str(str), _length(size), _hash(Hash(str)){};
[[nodiscard]] inline constexpr const char* c_str() const noexcept { return _str; }
[[nodiscard]] inline std::string std_str() const { return std::string(_str, _length); }
[[nodiscard]] inline constexpr size_t Length() const noexcept { return _length; }
[[nodiscard]] inline constexpr uint32_t GetHash() const noexcept { return _hash; }
constexpr std::size_t operator()(CaseInsensitiveConstString const& s) const noexcept { return s.GetHash(); }
inline constexpr operator uint32_t() const { return _hash; }
inline constexpr bool operator==(const CaseInsensitiveConstString& rhs) const { return _hash == rhs._hash; }
inline constexpr bool operator!=(const CaseInsensitiveConstString& rhs) const { return _hash != rhs._hash; }
inline constexpr bool operator==(const std::string& rhs) const { return _hash == Hash(rhs.c_str()); }
inline constexpr bool operator!=(const std::string& rhs) const { return _hash != Hash(rhs.c_str()); }
inline constexpr bool operator==(const char* rhs) const { return _hash == Hash(rhs); }
inline constexpr bool operator!=(const char* rhs) const { return _hash != Hash(rhs); }
};
}
inline constexpr Arbutils::CaseInsensitiveConstString operator"" _const_nocase(const char* c, size_t l) {
return Arbutils::CaseInsensitiveConstString(c, l);
}
inline constexpr Arbutils::CaseInsensitiveConstString operator"" _cnc(const char* c, size_t l) {
return Arbutils::CaseInsensitiveConstString(c, l);
}
namespace std {
template <> struct hash<Arbutils::CaseInsensitiveConstString> {
constexpr std::size_t operator()(Arbutils::CaseInsensitiveConstString const& s) const noexcept {
return s.GetHash();
}
};
}
#endif // ARBUTILS_CASEINSENSITIVECONSTSTRING_HPP

70
src/ConstString.hpp
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@ -5,61 +5,33 @@
#include <cstdint>
#include <cstring>
#include <string>
#include "__ConstStringCore.hpp"
namespace Arbutils {
class ConstString {
private:
const char* _str;
size_t _length;
uint32_t _hash;
ConstStringCore(
ConstString,
inline static uint32_t constexpr Hash(char const* input) {
return (*input) ? static_cast<uint32_t>((*input)) + 33 * Hash(input + 1) : 5381;
};)
inline static uint32_t constexpr Hash(char const* input) {
return (*input) ? static_cast<uint32_t>((*input)) + 33 * Hash(input + 1) : 5381;
}
inline static constexpr char charToLower(const char c) { return (c >= 'A' && c <= 'Z') ? c + ('a' - 'A') : c; }
inline static uint32_t constexpr LowercaseHash(char const* input) {
return charToLower(*input) ? static_cast<uint32_t>(charToLower(*input)) + 33 * LowercaseHash(input + 1)
: 5381;
}
inline static int constexpr Length(const char* str) { return *str ? 1 + Length(str + 1) : 0; }
public:
constexpr ConstString() : _str(""), _length(0), _hash(Hash("")){};
constexpr explicit ConstString(const char* str) : _str(str), _length(Length(str)), _hash(Hash(str)){};
constexpr explicit ConstString(const std::string& str)
: _str(str.c_str()), _length(str.length()), _hash(Hash(str.c_str())){};
constexpr explicit ConstString(const char* str, size_t size) : _str(str), _length(size), _hash(Hash(str)){};
[[nodiscard]] inline constexpr const char* c_str() const noexcept { return _str; }
[[nodiscard]] inline std::string std_str() const { return std::string(_str, _length); }
[[nodiscard]] inline constexpr size_t Length() const noexcept { return _length; }
[[nodiscard]] inline constexpr uint32_t GetHash() const noexcept { return _hash; }
constexpr std::size_t operator()(ConstString const& s) const noexcept { return s.GetHash(); }
inline constexpr operator uint32_t() const { return _hash; }
inline constexpr bool operator==(const ConstString& rhs) const { return _hash == rhs._hash; }
inline constexpr bool operator!=(const ConstString& rhs) const { return _hash != rhs._hash; }
inline constexpr bool operator==(const std::string& rhs) const { return _hash == Hash(rhs.c_str()); }
inline constexpr bool operator!=(const std::string& rhs) const { return _hash != Hash(rhs.c_str()); }
inline constexpr bool operator==(const char* rhs) const { return _hash == Hash(rhs); }
inline constexpr bool operator!=(const char* rhs) const { return _hash != Hash(rhs); }
};
}
inline constexpr Arbutils::ConstString operator"" _const(const char* c, size_t l) {
inline constexpr Arbutils::ConstString
operator"" _const(const char* c, size_t l) {
return Arbutils::ConstString(c, l);
}
inline constexpr Arbutils::ConstString operator"" _c(const char* c, size_t l) { return Arbutils::ConstString(c, l); }
namespace std {
template <> struct hash<Arbutils::ConstString> {
constexpr std::size_t operator()(Arbutils::ConstString const& s) const noexcept { return s.GetHash(); }
};
ConstStringCore(
CaseInsensitiveConstString,
inline static constexpr char charToLower(const char c) {
return (c >= 'A' && c <= 'Z') ? c + ('a' - 'A') : c;
} inline static uint32_t constexpr Hash(char const* input) {
return charToLower(*input) ? static_cast<uint32_t>(charToLower(*input)) + 33 * Hash(input + 1) : 5381;
};);
inline constexpr Arbutils::CaseInsensitiveConstString operator"" _const_nocase(const char* c, size_t l) {
return Arbutils::CaseInsensitiveConstString(c, l);
}
inline constexpr Arbutils::CaseInsensitiveConstString operator"" _cnc(const char* c, size_t l) {
return Arbutils::CaseInsensitiveConstString(c, l);
}
#endif // ARBUTILS_CONSTSTRING_HPP

57
src/__ConstStringCore.hpp Normal file
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@ -0,0 +1,57 @@
#ifndef ARBUTILS_CONSTSTRINGCORE_HPP
#define ARBUTILS_CONSTSTRINGCORE_HPP
#if WINDOWS
#define STDSTRINGEQUALITY \
inline bool operator==(const std::string& rhs) const { return _hash == Hash(rhs.c_str()); } \
inline bool operator!=(const std::string& rhs) const { return _hash != Hash(rhs.c_str()); }
#else
#define STDSTRINGEQUALITY \
inline constexpr bool operator==(const std::string& rhs) const { return _hash == Hash(rhs.c_str()); } \
inline constexpr bool operator!=(const std::string& rhs) const { return _hash != Hash(rhs.c_str()); }
#endif
#define ConstStringCore(name, hashFunction) \
namespace Arbutils { \
class name { \
private: \
const char* _str; \
size_t _length; \
uint32_t _hash; \
\
hashFunction; \
\
inline static int constexpr Length(const char* str) { return *str ? 1 + Length(str + 1) : 0; } \
\
public: \
constexpr name() : _str(""), _length(0), _hash(Hash("")){}; \
constexpr explicit name(const char* str) : _str(str), _length(Length(str)), _hash(Hash(str)){}; \
constexpr explicit name(const std::string& str) \
: _str(str.c_str()), _length(str.length()), _hash(Hash(str.c_str())){}; \
constexpr explicit name(const char* str, size_t size) : _str(str), _length(size), _hash(Hash(str)){}; \
\
[[nodiscard]] inline constexpr const char* c_str() const noexcept { return _str; } \
[[nodiscard]] inline std::string std_str() const { return std::string(_str, _length); } \
\
[[nodiscard]] inline constexpr size_t Length() const noexcept { return _length; } \
\
[[nodiscard]] inline constexpr uint32_t GetHash() const noexcept { return _hash; } \
\
constexpr std::size_t operator()(name const& s) const noexcept { return s.GetHash(); } \
inline constexpr operator uint32_t() const { return _hash; } \
\
inline constexpr bool operator==(const name& rhs) const { return _hash == rhs._hash; } \
inline constexpr bool operator!=(const name& rhs) const { return _hash != rhs._hash; } \
STDSTRINGEQUALITY \
inline constexpr bool operator==(const char* rhs) const { return _hash == Hash(rhs); } \
inline constexpr bool operator!=(const char* rhs) const { return _hash != Hash(rhs); } \
}; \
} \
\
namespace std { \
template <> struct hash<Arbutils::name> { \
constexpr std::size_t operator()(Arbutils::name const& s) const noexcept { return s.GetHash(); } \
}; \
}
#endif

1
tests/ConstStringTests.cpp
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@ -2,7 +2,6 @@
#include <cstring>
#include <unordered_map>
#include "../extern/catch.hpp"
#include "../src/CaseInsensitiveConstString.hpp"
#include "../src/ConstString.hpp"
TEST_CASE("Use const string in unordered_map", "[Utilities]") {