what is the use of using declaration type of namespacing over using directive type of namespacing??when to use each one of them?
what is the use of using declaration type of namespacing over using directive type
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what is the use of using declaration type of namespacing over using directive type of namespacing??when to use each one of them?
The declaration type of namespace directive introduces selected named symbols into your
codescope (and leaves other symbols from the same namespace inaccessible without the namespace qualifier).The using type of namespace directive introduces all symbols from the namespace into your
codescope – which means you don’t necessarily know exactly which symbols were introduced (there could have been undocumented symbols, or symbols left over from previous versions of the library, or …).