FeldmanHashMap find function NULL pointer

[9MW]

When use find function the value pointer occasionally return null,but when inspect it value it's isn't null. like if (posmap.find(xel, [&](PosHash::value_type& val) { const var& vx = val.second; if(vx==NULL){ vx->insert(cdid); } val.second->insert(cdid); })) when vx==NULL reinsert still get success.

[khizmax]

find only guarantees that val is valid in the functor and give no warranties about its fields. In multi-thread environment you should manage val fields yourself. This applies to any container in libcds.

[9MW]

try to add some lock

[9MW]

solved by while(true){ if(vx!=NULL){dosomething()} }