object::contains

## `object::contains`

Return `true` if the key is found.

### Synopsis

    bool
    contains(
        string_view key) const noexcept;

### Description

Checks if there is an element with key equal to `key`.

### Effects

    return find(key) != end();

### Complexity

Constant on average, worst case linear in `size()`.

### Exception Safety

No-throw guarantee.

### Parameters

Name | Description
--- | ---
`key` | The key of the element to find.

### See Also

`find`.

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