twoscomplement

// TransientFuction: A light-weight alternative to std::function [C++11]
// Pass any callback - including capturing lambdas - cheaply and quickly as a 
// function argument
// 
// Based on: 
// https://deplinenoise.wordpress.com/2014/02/23/using-c11-capturing-lambdas-w-vanilla-c-api-functions/
//
//  - No instantiation of called function at each call site
//  - Simple to use - use TransientFunction<> as the function argument
//  - Low cost: cheap setup, one indirect function call to invoke