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35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
#pragma once
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// generator/continuation for C++
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// author: Andrew Fedoniouk @ terrainformatica.com
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// idea borrowed from: "coroutines in C" Simon Tatham,
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// http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
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// BSD license
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template<typename T>
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struct _generator
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{
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T* _stack;
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int _line;
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_generator():_stack(0), _line(-1) {}
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void _push() { T* n = new T; *n = *static_cast<T*>(this); _stack = n; }
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bool _pop() { if(!_stack) return false; T* t = _stack; *static_cast<T*>(this) = *_stack; t->_stack = 0; delete t; return true; }
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~_generator() { while(_pop()); }
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};
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#define $generator(NAME) struct NAME : public _generator<NAME>
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#define $emit(T) bool operator()(T& _rv) { \
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if(_line < 0) _line=0; \
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$START: switch(_line) { case 0:;
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#define $stop } _line = 0; if(_pop()) goto $START; return false; }
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#define $restart(WITH) { _push(); _stack->_line = __LINE__; _line=0; WITH; goto $START; case __LINE__:; }
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#define $yield(V) \
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do {\
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_line=__LINE__;\
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_rv = (V); return true; case __LINE__:;\
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} while (0)
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