value::try_as_bool

## `value::try_as_bool`

Return `result` with the underlying `bool`

### Synopsis

    boost::system::result< bool & >
    try_as_bool() noexcept; (1)

    boost::system::result< bool >
    try_as_bool() const noexcept; (2)

### Description

If `is_bool()` is `true`, the result contains a reference to (1) or a copy to (2) the underlying `bool`, otherwise it contains an `error_code`.

### Example

The return value can be used in both a boolean context and to assign a variable:

    if( auto r = jv.try_as_bool() )
        return *r;

But can also be used to throw an exception on error:

    return jv.try_as_bool().value();

### Complexity

Constant.

### Exception Safety

No-throw guarantee.

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