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Toadhead

[C++] Use of unnamed namespaces

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I have a question about the unnamed namespaces in C++. If I understand it correctly, you can use a unnamed namespace to avoid conflicts with global variables with the same name. But my question is, why using an unnamed namespace instead of just a block using { and } ? If you put code between {}'s you'll make the code local right, than it wont conflict with the global variables with the same name either. Can someone comment on this? Kind regards, Rob

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Because at namespace scope you can't just use {} to create a new block. It won't compile.

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The purpose of anonymous namespaces isn't to avoid conflicts with global variables. The purpose of anonymous namespaces is to make "file local" variables, types and functions. As a general rule I always put "helper" functions in an anonymous namespace.

As for why you would use an anonymous namespace over a block, they aren't interchangeable. A namespace can only be nested inside other namespaces (including the global namespace), it cannot be inside a function or type. An anonymous block can only be inside functions.

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