Tag: boost optional

如何设置一个boost ::可选回到未初始化的状态？

如何“重置”/“取消”一个boost::optional ？ optional<int> x; if( x ) { // We won't hit this since x is uninitialized } x = 3; if( x ) { // Now we will hit this since x has been initialized } // What should I do here to bring x back to uninitialized state? if( x ) { // […]