string::operator+=

`string::operator+=`

Append characters to the string.

string&
operator+=(
    string_view sv); (1)

string&
operator+=(
    char ch); (2)

Strong guarantee.

*this

Name Description

Name	Description
`sv`	The `string_view` to append.
`ch`	The character to append.

sv

The string_view to append.

ch

The character to append.

Type Thrown On

Type	Thrown On
`boost::system::system_error`	The size of the string after the operation would exceed `max_size()`.

boost::system::system_error

The size of the string after the operation would exceed max_size().