elexis
5d2c20beb0
Replace boost::hash_combine with a lib/hash.h hash_combine performing
the same statement.
Replace inconspicuous global boost hash_value specializations with
std::hash specializations.
No performance difference was observed in three simple MeshManager
measurements.
Remove unused TAG_MASK and h_tag in h_mgr.cpp following 0748c5a75e.
Replace typedef with using keyword and sort header includes.
Differential Revision: https://code.wildfiregames.com/D2441
Tested on: clang 9.0.0, gcc 9.2.0, Jenkins/vs2015, Jenkins/gcc6
This was SVN commit r23191.
112 lines
2.5 KiB
C++
112 lines
2.5 KiB
C++
/* Copyright (C) 2019 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_CSTRINTERN
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#define INCLUDED_CSTRINTERN
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class CStrInternInternals;
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/**
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* Interned 8-bit strings.
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* Each instance with the same string content is a pointer to the same piece of
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* memory, allowing very fast string comparisons.
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*
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* Since a CStrIntern is just a dumb pointer, copying is very fast,
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* and pass-by-value should be preferred over pass-by-reference.
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*
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* Memory allocated for strings will never be freed, so don't use this for
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* unbounded numbers of strings (e.g. text rendered by gameplay scripts) -
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* it's intended for a small number of short frequently-used strings.
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*
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* Not thread-safe - only allocate these strings from the main thread.
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*/
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class CStrIntern
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{
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public:
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CStrIntern();
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explicit CStrIntern(const char* str);
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explicit CStrIntern(const std::string& str);
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/**
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* Returns cached FNV1-A hash of the string.
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*/
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u32 GetHash() const;
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/**
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* Returns null-terminated string.
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*/
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const char* c_str() const;
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/**
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* Returns length of string in bytes.
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*/
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size_t length() const;
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bool empty() const;
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/**
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* Returns as std::string.
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*/
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const std::string& string() const;
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/**
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* String equality.
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*/
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bool operator==(const CStrIntern& b) const
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{
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return m == b.m;
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}
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bool operator!=(const CStrIntern& b) const
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{
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return m != b.m;
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}
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/**
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* Compare with some arbitrary total order.
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* (In particular, this is not alphabetic order,
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* and is not consistent between runs of the game.)
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*/
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bool operator<(const CStrIntern& b) const
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{
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return m < b.m;
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}
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private:
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CStrInternInternals* m;
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};
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namespace std
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{
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template<>
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struct hash<CStrIntern>
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{
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std::size_t operator()(const CStrIntern& str) const
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{
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return str.GetHash();
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}
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};
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}
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#define X(id) extern CStrIntern str_##id;
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#define X2(id, str) extern CStrIntern str_##id;
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#include "CStrInternStatic.h"
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#undef X
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#undef X2
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#endif // INCLUDED_CSTRINTERN
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