Const correctness is a programming language feature, its most famous implementor being C++. In languages supporting this feature, variables can be said to be 'const'. When a const object is referenced, only the methods declared as const may be called. This allows programmers to formalise a specific design contract: they can promise at compile-time that a parameter of a function cannot be modified destructively.
Of course, const methods can only call other const methods, and cannot assign member variables
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