Andrzej Krzemienski wrote:

Hi Everyone, I would like to check if something like the following would be a useful addition to Boost.Core, or if something like this maybe exists:

I have a class like ``` struct X { std::string str; explicit X(const std::string& s) : str(s) {} }; ```

I need to transform a vector of strings into a vector of X through invoking the constructor of X:

``` std::vectorstd::string strings = {"cat", "dog", "emu", "fox"}; std::vector<X> xs;

std::transform(strings.begin(), strings.end(), std::back_inserter(xs),[](auto const& s) { return X(s); })); ```

It works, but a shorter version would be to introduce a component that is equivalent to the lambda:

``` std::transform(strings.begin(), strings.end(), std::back_inserter(xs), construct<X>)); ```

This exists at least four times in Boost (in Lambda, Hof, Phoenix, Functional/Factory), probably more that I haven't thought of. But it's not in Core (or in Bind). (Not in Lambda2 either despite https://github.com/boostorg/lambda2/issues/6) We try to not make Core the repository of every useful thing someone thinks of; this role was served by Utility in the past, or Functional for function objects, but these multiple unrelated component repositories never work out that well.