mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-27 22:14:57 +03:00
35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
#pragma once
|
|
|
|
// generator/continuation for C++
|
|
// author: Andrew Fedoniouk @ terrainformatica.com
|
|
// idea borrowed from: "coroutines in C" Simon Tatham,
|
|
// http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html
|
|
// BSD license
|
|
|
|
template<typename T>
|
|
struct _generator
|
|
{
|
|
T* _stack;
|
|
int _line;
|
|
_generator():_stack(0), _line(-1) {}
|
|
void _push() { T* n = new T; *n = *static_cast<T*>(this); _stack = n; }
|
|
bool _pop() { if(!_stack) return false; T* t = _stack; *static_cast<T*>(this) = *_stack; t->_stack = 0; delete t; return true; }
|
|
~_generator() { while(_pop()); }
|
|
};
|
|
|
|
#define $generator(NAME) struct NAME : public _generator<NAME>
|
|
|
|
#define $emit(T) bool operator()(T& _rv) { \
|
|
if(_line < 0) _line=0; \
|
|
$START: switch(_line) { case 0:;
|
|
|
|
#define $stop } _line = 0; if(_pop()) goto $START; return false; }
|
|
|
|
#define $restart(WITH) { _push(); _stack->_line = __LINE__; _line=0; WITH; goto $START; case __LINE__:; }
|
|
|
|
#define $yield(V) \
|
|
do {\
|
|
_line=__LINE__;\
|
|
_rv = (V); return true; case __LINE__:;\
|
|
} while (0)
|