Struct template negatable

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## Struct template negatable

boost::type_erasure::negatable

## Synopsis

    // In header: <boost/type_erasure/operators.hpp>

    template<typename T = _self, typename R = T>
    struct negatable {

      // public static functions
      static R apply(const T &);
    };

## Description

The negatable concept allow use of the unary minus operator on an any.

### `negatable` public static functions

1.     static R apply(const T &);