How are C++11 lambdas represented and passed?

Question

Passing a lambda is really easy in c++11:

func( []( int arg ) {
  // code
} ) ;

But I\'m wondering, what is the cost of passing a

Answer 1

See also C++11 lambda implementation and memory model

A lambda-expression is just that: an expression. Once compiled, it results in a closure object at runtime.

5.1.2 Lambda expressions [expr.prim.lambda]

The evaluation of a lambda-expression results in a prvalue temporary (12.2). This temporary is called the closure object.

The object itself is implementation-defined and may vary from compiler to compiler.

Here is the original implementation of lambdas in clang https://github.com/faisalv/clang-glambda