Chapter 4.3
ES.5: Keep scopes small
The nature of scope
“Scope” is another of those words that is overloaded with meaning. It comes from computer science, but each programming language puts its own little twist on it. In the specific case of C++, scope is a property of the declarations in your code, and it is where visibility and lifetime intersect.
All declarations in your program appear in one or more scopes. Scopes can nest, like namespaces, and most scopes are introduced with an identifier. Names are only visible in the scope they are declared in, but the lifetime of objects is not necessar-ily limited to the scope of their name. This fuzziness catches engineers out time and again when it comes to objects of dynamic storage duration.
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