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## Macro BOOST_YAP_USER_UNARY_OPERATOR

BOOST_YAP_USER_UNARY_OPERATOR

## Synopsis

    // In header: <boost/yap/user_macros.hpp>

    BOOST_YAP_USER_UNARY_OPERATOR(op_name, expr_template, result_expr_template)

## Description

Defines operator overloads for unary operator op_name that each take an expression instantiated from expr_template and return an expression instantiated from the result_expr_template expression template. One overload is defined for each of the qualifiers `const &`, `&`, and `&&`. For the lvalue reference overloads, the argument is captured by reference into the resulting expression. For the rvalue reference overload, the argument is moved into the resulting expression.

Example:

Parameters: |
`expr_template` | The expression template to which the overloads apply. expr_template must be an ExpressionTemplate.
`op_name` | The operator to be overloaded; this must be one of the unary enumerators in `expr_kind`, without the `expr_kind::` qualification.
`result_expr_template` | The expression template to use to instantiate the result expression. result_expr_template must be an ExpressionTemplate.