cpp17.nested.org

nested namespaces

source from: http://www.nuonsoft.com/blog/2017/08/01/c17-nested-namespaces/

// Before C++17

namespace Core {
    namespace Graphics {
        namespace Rendering {
            class PostProcessor
            {
            };
        }
    }
}

// After C++17

namespace Core::Graphics::Rendering {
    class PostProcessor
    {
    };
}