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# dmd.nspace

A scoped C++ namespace symbol
D supports the following syntax to declare symbol(s) as being part of a C++ namespace:

    extern (C++, "myNamespace") { /+ Symbols +/ }       // String variant
    extern (C++, SomeNamespace) { /+ Other symbols +/ } // Identifier variant

The first form is an attribute and only affects mangling, and is implemented in dmd.attrib. The second form introduces a named scope and allows symbols to be refered to with or without the namespace name, much like a named template mixin, and is implemented in this module.

    extern (C++, Basket)
    {
        struct StrawBerry;
        void swapFood (Strawberry* f1, Strawberry* f2);
    }
    void main ()
    {
        Basket.StrawBerry fruit1;
        StrawBerry fruit2;
        Basket.swapFood(fruit1, fruit2);
        swapFood(fruit1, fruit2);
    }

Hence the Nspace symbol implements the usual ScopeDsymbol semantics.
Note that it implies extern(C++) so it cannot be used as a generic named scope. Additionally, Nspace with the same Identifier can be defined in different module (as C++ allows a namespace to be spread accross translation units), but symbols in it should be considered part of the same scope. Lastly, not all possible C++ namespace names are valid D identifier.
See Also:
https://github.com/dlang/dmd/pull/10031
Authors:
Walter Bright
License:
Boost License 1.0

Source nspace.d

Documentation https://dlang.org/phobos/dmd_nspace.html

Coverage https://codecov.io/gh/dlang/dmd/src/master/src/dmd/nspace.d

class `Nspace`: dmd.dsymbol.ScopeDsymbol;
  Ditto
  Expression `identExp`;
    Namespace identifier resolved during semantic.

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