Hi boosters, I'm intrested in Lambda, so I have worked out some new features, and suggest boost lib add them. What can I do next? NEW features: 1. return. why lambda lib do not include this? 2. generate iterator/iteration by lambda using yield return/yield break. 3. local/global var declare and using. 1. return e.g. boost::function<char(int)> f = ( if_ ( _1 >= 0 ) [ return_('a') ], return_('b') ); p.s. return should be supported. 2. iterator/iteration generation by lambda using yield return/yield break const char* p; // we shuld use the local var inside lambda instead of this var p. refer to section 3 iteration<char> it = ( for_(var(p) = _1, *var(p), var(p)++) [ if_(*var(p) != ' ') [ yield_return(*var(p)) ] if_(*var(p) == ';') [ yield_break() ] ] ) ("I love this game; no use"); p.s. The packing iteration interface is very like the yield keyword in C# IEnumeable 3.local/global var declare and using e.g. char a; var_name x, y, z; global_var<int>(y); // put this line inside lambda is ok, just before use it ( ( local_var<int>(x), // local var declare // global_var<int>(y), var(a) = 'a', var<int>(x) = _2, // using local var x ), ( local_var<char>(z), var(a), var<int>(x) = _1, // error! x is not local var here. var<int>(y), // ok for global even if another lambda var<char>(z) = 'b', ) ) p.s. Now, in my work. It's hard to simplify var<T>(x) to var(x). It's a hard template working.