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One of the most important aspects of data encapsulation as embodied by classes and similar constructs is the ability to maintain class invariants by restricting access to the implementation data through a well defined interface. (Incidentally, a class without significant invariants is little more than a tuple of values, which is why the presence of getters and setters is a sure sign of poor design
High-speed memory caches present in modern computer architectures favor data structures with good locality of reference, i.e. the property by which elements accessed in sequence are located in memory addresses close to each other. This is the rationale behind classes such as Boost.Container flat associative containers, that emulate the functionality of standard C++ node-based associative container
struct mvoid{}; template<template<typename> class M,class T> M<T> mreturn(T&& t) { return std::forward<T>(t); } // maybe built on top of boost::optional // maybe<T>(t) is Just t, boost::none acts as Nothing template<typename T> struct maybe:boost::optional<T> { using super=boost::optional<T>; using super::super; }; template<typename T,typename F> auto operator>>=(const maybe<T>& m,F&& f) { return
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