Re: [Boost-users] Boost multi-thread issue ---- use macro

Peisheng Wang wrote:

Why

#if ISTHREADSAFE boost::mutex::scoped_lock lock(CacheInfo_mutex); # endif

functions well , but not

if(isThreadSafe) { boost::mutex::scoped_lock lock(CacheInfo_mutex); }

Because the scoped_lock declaration goes out of scope at the }. If you had written: #if ISTHREADSAFE { boost::mutex::scoped_lock lock(CacheInfo_mutex); } # endif it would have the same problem.