Re: [Boost-users] [variant] Efficiency

2009/6/17 Maxim Koshelev

In common case it is not compiller solution due to complexity of constructors/destructors of holded class.

variant v( B() );

Note that this code does not create an instance of variant, but declares a function.

this code MUST call constructor of class B two times. First time when B is created, second time when just created instance of B copyied to variant. Valid solution is use type-traits. Something like:

variant v( Trait<B>())

Same here. Roman Perepelitsa.