string::operator[]

## `string::operator[]`

Return a character without bounds checking.

### Synopsis

    char&
    operator[](
        std::size_t pos); (1)

    const char&
    operator[](
        std::size_t pos) const; (2)

### Description

Returns a reference to the character specified at location `pos`.

### Complexity

Constant.

### Preconditions

    pos < size()

### Parameters

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

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