# mapping.rs - source
Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/pyo3-0.13.2/src/class/mapping.rs`.
Keywords: rust, rustlang, rust-lang

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    // Copyright (c) 2017-present PyO3 Project and Contributors

    //! Python Mapping Interface
    //! Trait and support implementation for implementing mapping support

    use crate::callback::IntoPyCallbackOutput;
    use crate::{exceptions, ffi, FromPyObject, PyClass, PyObject};

    /// Mapping interface
    #[allow(unused_variables)]
    pub trait PyMappingProtocol<'p>: PyClass {
        fn __len__(&'p self) -> Self::Result
        where
            Self: PyMappingLenProtocol<'p>,
        {
            unimplemented!()
        }

        fn __getitem__(&'p self, key: Self::Key) -> Self::Result
        where
            Self: PyMappingGetItemProtocol<'p>,
        {
            unimplemented!()
        }

        fn __setitem__(&'p mut self, key: Self::Key, value: Self::Value) -> Self::Result
        where
            Self: PyMappingSetItemProtocol<'p>,
        {
            unimplemented!()
        }

        fn __delitem__(&'p mut self, key: Self::Key) -> Self::Result
        where
            Self: PyMappingDelItemProtocol<'p>,
        {
            unimplemented!()
        }

        fn __reversed__(&'p self) -> Self::Result
        where
            Self: PyMappingReversedProtocol<'p>,
        {
            unimplemented!()
        }
    }

    // The following are a bunch of marker traits used to detect
    // the existance of a slotted method.

    pub trait PyMappingLenProtocol<'p>: PyMappingProtocol<'p> {
        type Result: IntoPyCallbackOutput<usize>;
    }

    pub trait PyMappingGetItemProtocol<'p>: PyMappingProtocol<'p> {
        type Key: FromPyObject<'p>;
        type Result: IntoPyCallbackOutput<PyObject>;
    }

    pub trait PyMappingSetItemProtocol<'p>: PyMappingProtocol<'p> {
        type Key: FromPyObject<'p>;
        type Value: FromPyObject<'p>;
        type Result: IntoPyCallbackOutput<()>;
    }

    pub trait PyMappingDelItemProtocol<'p>: PyMappingProtocol<'p> {
        type Key: FromPyObject<'p>;
        type Result: IntoPyCallbackOutput<()>;
    }

    pub trait PyMappingReversedProtocol<'p>: PyMappingProtocol<'p> {
        type Result: IntoPyCallbackOutput<PyObject>;
    }

    py_len_func!(len, PyMappingLenProtocol, Self::__len__);
    py_binary_func!(getitem, PyMappingGetItemProtocol, Self::__getitem__);
    py_func_set!(setitem, PyMappingSetItemProtocol, Self::__setitem__);
    py_func_del!(delitem, PyMappingDelItemProtocol, Self::__delitem__);
    py_func_set_del!(
        setdelitem,
        PyMappingSetItemProtocol,
        PyMappingDelItemProtocol,
        Self,
        __setitem__,
        __delitem__
    );