capture by value class members

Question

Is there a way, when writing a lambda function within a member function, to capture fields of the enclosing class by value? The default catch-all = doesn\'t work be

Answer 1

C++ is a language of speed, and one of most important things in design of the language is performance. If standard designers want to implement an idiom a way to capture all variables of a class by value, think of a really huge class and say me do you want to capture them all by value? even to capture all variables that declared in a function(including this) there is 2 way:

• by value: variables that defined in a function, leave in stack so they can't be multi megabytes but classes that use heap like vector can still be huge. So take care for using this!

• by reference: that actually save stack pointer.

So you see there is no efficient way to capture all variables of a class with value, but you can make a local copy of that class in your function and then capture it by reference!