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##### basic_static_string::operator+= (2 of 5 overloads)

Append to the string.

###### Synopsis

    constexpr basic_static_string&
    operator+=(
        basic_static_string::value_type ch);

###### Description

Appends a character to the end of the string.

###### Exception Safety

Strong guarantee.

###### Parameters

Name | Description
--- | ---
`ch` | The character to append.

###### Exceptions

Type | Thrown On
--- | ---
`std::length_error` | `size() >= max_size()`