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## Macro BOOST_YAP_USER_LITERAL_PLACEHOLDER_OPERATOR

BOOST_YAP_USER_LITERAL_PLACEHOLDER_OPERATOR

## Synopsis

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

    BOOST_YAP_USER_LITERAL_PLACEHOLDER_OPERATOR(expr_template)

## Description

Defines user defined literal template that creates literal placeholders instantiated from the expr_template expression template. It is recommended that you put this in its own namespace.

Parameters: |
`expr_template` | The expression template to use to instantiate the result expression. expr_template must be an ExpressionTemplate.