array::try_at

## `array::try_at`

Access an element, with bounds checking.

### Synopsis

    boost::system::result< value & >
    try_at(
        std::size_t pos) noexcept; (1)

    boost::system::result< value const & >
    try_at(
        std::size_t pos) const noexcept; (2)

### Description

Returns `boost::system::result` containing a reference to the element specified at location `pos`, if `pos` is within the range of the container. Otherwise the result contains an `error_code`.

### Exception Safety

No-throw guarantee.

### Parameters

Name | Description
--- | ---
`pos` | A zero-based index.

### Complexity

Constant.

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