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## Function template else_

boost::yap::else_

## Synopsis

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

    template<typename Expr> decltype(auto) constexpr else_(Expr && expr);

## Description

Returns the else-expression in an if_else expression.

Equivalent to `get(expr, 2_c)`.

| Note
`else_()` is only valid if Expr is an `expr_kind::if_else` expression.