Macro BOOST_PROTO_EXTENDS_USING_ASSIGN

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## Macro BOOST_PROTO_EXTENDS_USING_ASSIGN

BOOST_PROTO_EXTENDS_USING_ASSIGN — For exposing in classes that inherit from `proto::extends<>` the overloaded assignment operators defined therein.

## Synopsis

    // In header: <boost/proto/extends.hpp>

    BOOST_PROTO_EXTENDS_USING_ASSIGN(Derived)

## Description

The standard usage of `proto::extends<>` is to inherit from it. However, the derived class automatically gets a compiler-generated assignment operator that will hide the ones defined in `proto::extends<>`. Use `BOOST_PROTO_EXTENDS_USING_ASSIGN()` in the derived class to unhide the assignment operators defined in `proto::extends<>`.

See `proto::extends<>` for an example that demonstrates usage of `BOOST_PROTO_EXTENDS_USING_ASSIGN()`.