C++ High Performance

Composability and pipeability

The full power of views comes from the ability to combine them. As they don't copy the actual data, you can express multiple operations on a dataset while, internally, only iterating over it once.

namespace rv = ranges::view;auto numbers = std::vector<int>{1,2,3,4,5,6,7}; // Create a squared viewauto squared_view = rv::transform(numbers, [](auto v){  return v * v; });// squared_view evaluates to "1, 4, 9, 16, 25, 36, 49" // Add a filter onto the squared viewauto odd_squared_view = rv::filter(squared_view, [](auto v){  return (v % 2) == 1; });// odd_squared_view evaluates to "1, 9, 25, 49"

Now this might not look syntactically elegant, but the ranges library also allows us to compose the views using a the pipe operator ...