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#pragma once |
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#include "base/ints.h" |
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#include <string_view> |
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#include <string> |
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#include <unordered_map> |
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// 1 = include text in hash, 0=don't |
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// todo(Gustav): move to a config instead |
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#define USE_HASH_TEXT 1 |
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namespace eu |
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{ |
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/// fnv-1a hash. |
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/// https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function |
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constexpr u64 hash64(const std::string_view str, u64 hash = 0xcbf29ce484222325) |
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{ return str.empty() ? hash : hash64(str.substr(1), (hash ^ str[0]) * 0x100000001b3); } |
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/// Hash of a non-owning string. |
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/// It will be (pretty) printed as the original string if that is enabled. |
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/// Treat it as a regular `std::string_view` but without the string functionality. |
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/// @see \ref hash64 |
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/// @see \ref HshO |
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struct Hsh |
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{ |
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/// The actual hash. |
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/// Prefer to use operators on \ref Hsh instead of accessing this directly. |
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u64 hash; |
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#if USE_HASH_TEXT == 1 |
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/// Non-owning storage of the printable string, if enabled. |
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/// Please ignore if possible and just print as normal. |
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std::string_view text; |
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#endif |
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/// Creates a new hash object and computes the hash at compile time if possible. |
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constexpr Hsh(const std::string_view s) |
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: hash( hash64(s) ) |
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#if USE_HASH_TEXT == 1 |
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, text(s) |
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#endif |
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{ } |
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}; |
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/// Hash of an owning string. |
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/// It will be (pretty) printed as the original string if that is enabled. |
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/// Treat it as a regular `std::string` but without the string functionality. |
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/// @see \ref hash64 |
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/// @see \ref Hsh |
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struct HshO |
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{ |
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/// The actual hash. |
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/// Prefer to use operators on \ref HshO instead of accessing this directly. |
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u64 hash; |
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#if USE_HASH_TEXT == 1 |
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/// Owning storage of the printable string, if enabled. |
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/// Please ignore if possible and just print as normal. |
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std::string text; |
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#endif |
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/// Creates a new hash object and computes the hash at compile time if possible. |
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constexpr HshO(const std::string& s) |
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: hash(hash64(s)) |
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#if USE_HASH_TEXT == 1 |
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, text(s) |
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#endif |
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{ } |
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/// Creates a new hash object and computes the hash at compile time if possible. |
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constexpr HshO(const std::string_view& s) |
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: hash(hash64(s)) |
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#if USE_HASH_TEXT == 1 |
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, text(s) |
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#endif |
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{ } |
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/// Copy data from a non-owning hash. |
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constexpr HshO(const Hsh& o) |
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: hash(o.hash) |
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#if USE_HASH_TEXT == 1 |
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, text(o.text) |
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#endif |
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{ } |
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}; |
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#define OP(op) \ |
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constexpr bool operator op(const Hsh& lhs, const Hsh& rhs)\ |
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{ return lhs.hash op rhs.hash; }\ |
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constexpr bool operator op(const HshO& lhs, const Hsh& rhs)\ |
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{ return lhs.hash op rhs.hash; }\ |
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constexpr bool operator op(const Hsh& lhs, const HshO& rhs)\ |
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{ return lhs.hash op rhs.hash; }\ |
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constexpr bool operator op(const HshO& lhs, const HshO& rhs)\ |
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{ return lhs.hash op rhs.hash; } |
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OP(==) OP(!=) OP(<) OP(>) OP(<=) OP(>=) |
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#undef OP |
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std::string string_from(const Hsh h); |
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std::string string_from(const HshO& h); |
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ADD_CATCH_FORMATTER_DEF(Hsh) |
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ADD_CATCH_FORMATTER_DEF(HshO) |
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} |
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ADD_DEFAULT_FORMATTER(eu::Hsh, std::string, eu::string_from); |
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ADD_DEFAULT_FORMATTER(eu::HshO, std::string, eu::string_from); |
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namespace std |
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{ |
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/// \private |
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template <> struct hash<eu::Hsh> |
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{ |
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std::size_t operator()(const eu::Hsh& x) const |
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{ return x.hash; } |
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}; |
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/// \private |
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template <> struct hash<eu::HshO> |
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{ |
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std::size_t operator()(const eu::HshO& x) const |
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{ return x.hash; } |
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}; |
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} |
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