Macro BOOST_PROTO_EXTENDS_SUBSCRIPT

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## Macro BOOST_PROTO_EXTENDS_SUBSCRIPT

BOOST_PROTO_EXTENDS_SUBSCRIPT — For adding to an expression extension class an overloaded subscript operator that builds an expression template.

## Synopsis

    BOOST_PROTO_EXTENDS_SUBSCRIPT()

## Description

Use `BOOST_PROTO_EXTENDS_SUBSCRIPT()` after `BOOST_PROTO_BASIC_EXTENDS()` to give an expression extension class an overloaded subscript operator that builds an expression template.

See also:

- `BOOST_PROTO_BASIC_EXTENDS()`
- `BOOST_PROTO_EXTENDS_ASSIGN()`
- `BOOST_PROTO_EXTENDS_FUNCTION()`
- `BOOST_PROTO_EXTENDS()`