mirror of
https://github.com/paboyle/Grid.git
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212 lines
8.3 KiB
C++
212 lines
8.3 KiB
C++
#ifndef GRID_MACRO_MAGIC_H
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#define GRID_MACRO_MAGIC_H
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///////////////////////////////////////////
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// Strong credit to :
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//
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// http://jhnet.co.uk/articles/cpp_magic
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//
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//
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// "The C Pre-Processor (CPP) is the somewhat basic macro system used by the C
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// programming language to implement features such as #include and #define
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// which allow very simple text-substitutions to be carried out at compile time.
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// In this article we abuse the humble #define to implement if-statements and iteration.
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//
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// Before we begin, a disclaimer: these tricks, while perfectly valid C, should not be
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// considered good development practice and should almost certainly not be used for "real work".
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// That said it can totally be used for fun home-automation projects...
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//
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// https://github.com/18sg/uSHET/blob/master/lib/cpp_magic.h
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//
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// The cpp_magic.h license (prior to my modifications):
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/*
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Copyright (c) 2014 Thomas Nixon, Jonathan Heathcote
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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///////////////////////////////////////////
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#define strong_inline __attribute__((always_inline)) inline
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#ifndef MAX
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#define MAX(x,y) ((x)>(y)?(x):(y))
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#define MIN(x,y) ((x)>(y)?(y):(x))
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#endif
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#define GRID_MACRO_FIRST(a, ...) a
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#define GRID_MACRO_SECOND(a, b, ...) b
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#define GRID_MACRO_EMPTY()
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#define GRID_MACRO_EVAL(...) GRID_MACRO_EVAL64(__VA_ARGS__)
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#define GRID_MACRO_EVAL1024(...) GRID_MACRO_EVAL512(GRID_MACRO_EVAL512(__VA_ARGS__))
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#define GRID_MACRO_EVAL512(...) GRID_MACRO_EVAL256(GRID_MACRO_EVAL256(__VA_ARGS__))
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#define GRID_MACRO_EVAL256(...) GRID_MACRO_EVAL128(GRID_MACRO_EVAL128(__VA_ARGS__))
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#define GRID_MACRO_EVAL128(...) GRID_MACRO_EVAL64(GRID_MACRO_EVAL64(__VA_ARGS__))
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#define GRID_MACRO_EVAL64(...) GRID_MACRO_EVAL32(GRID_MACRO_EVAL32(__VA_ARGS__))
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#define GRID_MACRO_EVAL32(...) GRID_MACRO_EVAL16(GRID_MACRO_EVAL16(__VA_ARGS__))
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#define GRID_MACRO_EVAL16(...) GRID_MACRO_EVAL8(GRID_MACRO_EVAL8(__VA_ARGS__))
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#define GRID_MACRO_EVAL8(...) GRID_MACRO_EVAL4(GRID_MACRO_EVAL4(__VA_ARGS__))
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#define GRID_MACRO_EVAL4(...) GRID_MACRO_EVAL2(GRID_MACRO_EVAL2(__VA_ARGS__))
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#define GRID_MACRO_EVAL2(...) GRID_MACRO_EVAL1(GRID_MACRO_EVAL1(__VA_ARGS__))
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#define GRID_MACRO_EVAL1(...) __VA_ARGS__
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#define GRID_MACRO_DEFER1(m) m GRID_MACRO_EMPTY()
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#define GRID_MACRO_DEFER2(m) m GRID_MACRO_EMPTY GRID_MACRO_EMPTY()()
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#define GRID_MACRO_DEFER3(m) m GRID_MACRO_EMPTY GRID_MACRO_EMPTY GRID_MACRO_EMPTY()()()
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#define GRID_MACRO_DEFER4(m) m GRID_MACRO_EMPTY GRID_MACRO_EMPTY GRID_MACRO_EMPTY GRID_MACRO_EMPTY()()()()
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#define GRID_MACRO_IS_PROBE(...) GRID_MACRO_SECOND(__VA_ARGS__, 0)
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#define GRID_MACRO_PROBE() ~, 1
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#define GRID_MACRO_CAT(a,b) a ## b
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#define GRID_MACRO_NOT(x) GRID_MACRO_IS_PROBE(GRID_MACRO_CAT(_GRID_MACRO_NOT_, x))
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#define _GRID_MACRO_NOT_0 GRID_MACRO_PROBE()
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#define GRID_MACRO_BOOL(x) GRID_MACRO_NOT(GRID_MACRO_NOT(x))
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#define GRID_MACRO_IF_ELSE(condition) _GRID_MACRO_IF_ELSE(GRID_MACRO_BOOL(condition))
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#define _GRID_MACRO_IF_ELSE(condition) GRID_MACRO_CAT(_GRID_MACRO_IF_, condition)
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#define _GRID_MACRO_IF_1(...) __VA_ARGS__ _GRID_MACRO_IF_1_ELSE
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#define _GRID_MACRO_IF_0(...) _GRID_MACRO_IF_0_ELSE
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#define _GRID_MACRO_IF_1_ELSE(...)
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#define _GRID_MACRO_IF_0_ELSE(...) __VA_ARGS__
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#define GRID_MACRO_HAS_ARGS(...) GRID_MACRO_BOOL(GRID_MACRO_FIRST(_GRID_MACRO_END_OF_ARGUMENTS_ __VA_ARGS__)())
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#define _GRID_MACRO_END_OF_ARGUMENTS_() 0
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#define GRID_MACRO_MAP(m, first, second, ...) \
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m(first,second) \
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GRID_MACRO_IF_ELSE(GRID_MACRO_HAS_ARGS(__VA_ARGS__))( \
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GRID_MACRO_DEFER4(_GRID_MACRO_MAP)()(m, __VA_ARGS__) \
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)( \
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/* Do nothing, just terminate */ \
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)
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#define _GRID_MACRO_MAP() GRID_MACRO_MAP
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// These are the Grid extensions to serialisation (beyond popping first AND second)
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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#define GRID_MACRO_MEMBER(A,B) A B;
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#define GRID_MACRO_COMP_MEMBER(A,B) result = (result and (lhs. B == rhs. B));
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#define GRID_MACRO_OS_WRITE_MEMBER(A,B) os<< #A <<" " #B << " = " << obj. B << " ; " <<std::endl;
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#define GRID_MACRO_READ_MEMBER(A,B) Grid::read(RD,#B,obj. B);
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#define GRID_MACRO_WRITE_MEMBER(A,B) Grid::write(WR,#B,obj. B);
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#define GRID_SERIALIZABLE_CLASS_MEMBERS(cname,...)\
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std::string SerialisableClassName(void) {return std::string(#cname);} \
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_MEMBER,__VA_ARGS__))\
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template <typename T>\
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static inline void write(Writer<T> &WR,const std::string &s, const cname &obj){ \
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push(WR,s);\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_WRITE_MEMBER,__VA_ARGS__)) \
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pop(WR);\
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}\
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template <typename T>\
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static inline void read(Reader<T> &RD,const std::string &s, cname &obj){ \
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if (!push(RD,s))\
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{\
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std::cout << Grid::GridLogWarning << "IO: Cannot open node '" << s << "'" << std::endl;\
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return;\
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};\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_READ_MEMBER,__VA_ARGS__)) \
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pop(RD);\
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}\
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friend inline std::ostream & operator << (std::ostream &os, const cname &obj ) { \
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os<<"class "<<#cname<<" {"<<std::endl;\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_OS_WRITE_MEMBER,__VA_ARGS__)) \
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os<<"}"; \
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return os;\
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}\
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friend inline bool operator==(const cname &lhs, const cname &rhs) {\
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bool result = true;\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_COMP_MEMBER,__VA_ARGS__))\
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return result;\
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}
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#define GRID_ENUM_TYPE(obj) std::remove_reference<decltype(obj)>::type
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#define GRID_MACRO_ENUMVAL(A,B) A = B,
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#define GRID_MACRO_ENUMCASE(A,B) case GRID_ENUM_TYPE(obj)::A: Grid::write(WR,s,#A); break;
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#define GRID_MACRO_ENUMTEST(A,B) else if (buf == #A) {obj = GRID_ENUM_TYPE(obj)::A;}
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#define GRID_MACRO_ENUMCASEIO(A,B) case GRID_ENUM_TYPE(obj)::A: os << #A; break;
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#define GRID_SERIALIZABLE_ENUM(name,undefname,...)\
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class name: public Grid::Serializable\
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{\
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public:\
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enum\
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{\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_ENUMVAL,__VA_ARGS__))\
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undefname = -1\
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};\
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public:\
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name(void): value_(undefname) {};\
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name(int value): value_(value) {};\
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template <typename T>\
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static inline void write(Grid::Writer<T> &WR,const std::string &s, const name &obj)\
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{\
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switch (obj.value_)\
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{\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_ENUMCASE,__VA_ARGS__))\
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default: Grid::write(WR,s,#undefname); break;\
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}\
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}\
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\
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template <typename T>\
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static inline void read(Grid::Reader<T> &RD,const std::string &s, name &obj)\
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{\
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std::string buf;\
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Grid::read(RD, s, buf);\
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if (buf == #undefname) {obj = name::undefname;}\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_ENUMTEST,__VA_ARGS__))\
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else {obj = name::undefname;}\
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}\
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inline operator int(void) const\
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{\
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return value_;\
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}\
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inline friend std::ostream & operator<<(std::ostream &os, const name &obj)\
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{\
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switch (obj) {\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_ENUMCASEIO,__VA_ARGS__))\
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default: os << #undefname; break;\
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}\
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return os;\
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}\
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inline friend std::istream & operator>>(std::istream &is, name &obj)\
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{\
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std::string buf;\
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is >> buf;\
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if (buf == #undefname) {obj = name::undefname;}\
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GRID_MACRO_EVAL(GRID_MACRO_MAP(GRID_MACRO_ENUMTEST,__VA_ARGS__))\
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else {obj = name::undefname;}\
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return is;\
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}\
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private:\
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int value_;\
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};
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#endif
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