Add range-v3

[allanleal]

Adding the range-v3 library to conda-forge would be very welcome. Example:

using namespace ranges;

std::vector<int> vi{1,2,3,4,5,6,7,8,9,10};
auto rng = vi | view::remove_if([](int i){return i % 2 == 1;})
              | view::transform([](int i){return std::to_string(i);});
// rng == {"2","4","6","8","10"};

I can help as much as possible, but currently not very familiar with the entire process.

https://github.com/ericniebler/range-v3
https://ericniebler.github.io/range-v3/

[stuarteberg]

@allanleal

I can help as much as possible, but currently not very familiar with the entire process.

Since range-v3 is a header-only library, it shouldn't be too hard to get it into conda-forge. The basic procedure is to clone this repo (staged recipes), and create a new directory in the recipes directory:

staged-recipes/
  recipes/
    example/   # Don't delete the example
      meta.yaml
    range-v3/  # add this one
      meta.yaml
      build.sh
      bld.bat

As for the contents of meta.yaml, build.sh, and bld.bat, you can try looking at another recipe as an example. For instance xtensor is a header-only C++ library, so its recipe in the xtensor-feedstock would be a good place to look.

(Although it's header-only, their build.sh script still uses cmake and make install rather than a simple "install" command like cp -R include/* ${PREFIX}/include. I guess that's because they want to install the cmake modules that makes it easier for other cmake-based projects to use xtensor.)

Anyway, test your recipe with conda build staged-recipes/range-v3, and then submit a pull request here with your changes.

[bluescarni]

I have a PR up for this: #22443.