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##### basic_static_string::operator+= (3 of 5 overloads)

Append to the string.

###### Synopsis

    constexpr basic_static_string&
    operator+=(
        basic_static_string::const_pointer s);

###### Description

Appends `count` characters from the string pointed to by `s` to the end of the string, where `count` is `traits_type::length(s)`.

###### Exception Safety

Strong guarantee.

###### Return Value

`*this`

###### Parameters

Name | Description
--- | ---
`s` | The string to append.

###### Exceptions

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