Is it correct to capture the perfectly-forwarded mStuff variable with the &mStuff syntax? Yes, assuming that you don’t use this lambda outside doSomething. Your code captures mStuff per reference and will correctly forward it inside the lambda. For mStuff being a parameter pack it suffices to use a simple-capture with a pack-expansion: template <typename… T> … Read more
You would do: template <typename …Params> void f(Params&&… params) { y(std::forward<Params>(params)…); } The … pretty much says “take what’s on the left, and for each template parameter, unpack it accordingly.”
You have to understand the forwarding problem. You can read the entire problem in detail, but I’ll summarize. Basically, given the expression E(a, b, … , c), we want the expression f(a, b, … , c) to be equivalent. In C++03, this is impossible. There are many attempts, but they all fail in some regard. … Read more
std::move takes an object and allows you to treat it as a temporary (an rvalue). Although it isn’t a semantic requirement, typically a function accepting a reference to an rvalue will invalidate it. When you see std::move, it indicates that the value of the object should not be used afterwards, but you can still assign … Read more
Herb Sutter, chair of the C++ standardization committee, writes on his blog: That C++11 doesn’t include make_unique is partly an oversight, and it will almost certainly be added in the future. He also gives an implementation that is identical with the one given by the OP. Edit: std::make_unique now is part of C++14.
You have to understand the forwarding problem. You can read the entire problem in detail, but I’ll summarize. Basically, given the expression E(a, b, … , c), we want the expression f(a, b, … , c) to be equivalent. In C++03, this is impossible. There are many attempts, but they all fail in some regard. … Read more
It declares an rvalue reference (standards proposal doc). Here’s an introduction to rvalue references. Here’s a fantastic in-depth look at rvalue references by one of Microsoft’s standard library developers. CAUTION: the linked article on MSDN (“Rvalue References: C++0x Features in VC10, Part 2”) is a very clear introduction to Rvalue references, but makes statements about … Read more