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#ifndef THREADLOCAL_H
#define THREADLOCAL_H
#ifndef SETLOCAL_SWAP
# define SETLOCAL_SWAP 0
#endif
#ifdef BOOST_NO_MT
# define THREADLOCAL
#else
#ifdef _MSC_VER
//FIXME: doesn't work with DLLs ... use TLS apis instead (http://www.boost.org/libs/thread/doc/tss.html)
# define THREADLOCAL __declspec(thread)
#else
# define THREADLOCAL __thread
#endif
#endif
#include <algorithm> //swap
// naturally, the below are only thread-safe if value is THREADLOCAL
template <class D>
struct SaveLocal {
D &value;
D old_value;
SaveLocal(D& val) : value(val), old_value(val) {}
~SaveLocal() {
#if SETLOCAL_SWAP
swap(value,old_value);
#else
value=old_value;
#endif
}
};
template <class D>
struct SetLocal {
D &value;
D old_value;
SetLocal(D& val,const D &new_value) : value(val), old_value(
#if SETLOCAL_SWAP
new_value
#else
val
#endif
) {
#if SETLOCAL_SWAP
swap(value,old_value);
#else
value=new_value;
#endif
}
~SetLocal() {
#if SETLOCAL_SWAP
swap(value,old_value);
#else
value=old_value;
#endif
}
};
#endif
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