Namespaces

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Summary

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• Better organization

• How to define a namespace

• Adding symbols

• Accessing symbols from namespaces

Better organization

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Namespaces are a very useful to better organize your programs. They are used to divide the global space in sub-spaces. This feature looks like the C++ namespaces or the modules in languages like Python or Rust.

How to define a namespace

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A namespace is defined using the namespace keyword. The name of the namespace is placed right after it and then you can define the body, which contains all the namespace symbols.

Namespaces can also be nested.

namespace world {
    namespace animals {
        // ...
    }
    namespace plants {
        // ...
    }
}

Adding symbols

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To add symbols to a namespace after the namespace definition, just do as if you were redefining it.

namespace plants {
    struct Flower {}
}

namespace plants {
    var plant_count: i32 = 0;
    // namespace `plants` now contains `Flower` and `plant_count`
}

Accessing symbols from namespaces

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When you define a symbol in a namespace, its name gets scoped. This means that, if you define a structure named Wolf in the animals namespace, you would have to write animals::Wolf every time you want to use this structure, even inside the namespace.