Trim Curve

so i have started using blender curves a lot more recently to design shapes that can be turned into meshes for various uses, one thing i wish blender had was the ability to trim curves with other curves

i have used this feature in rhino and it makes everything so much easier and quicker, i know that someone is going to say "well why not just create a bezier curve and work with that?", A: that takes way too long and B you only end up with an approximation of something like the example i've given here.