Method lfun::`+=()

Method `+=

this_program `+=(zero arg)

Description

Destructive addition/concatenation callback.

This is used by `+. It's called with the argument that follow this object in the argument list of the call to `+. It should update this object to represent the addition/concatenation between it and the argument. It should always return this object.

Note

This function should only be implemented if lfun::`+() also is. It should only work as a more optimized alternative to that one, for the case when it's safe to change the object destructively and use it directly as the result.

Note

This function is not an lfun for the += operator. It's only whether or not it's safe to do a destructive change that decides if this function or lfun::`+() is called; both the + operator and the += operator can call either one.

Note

In versions of Pike prior to 8.1.10 this function could get called with multiple arguments.

See also

lfun::`+(), `+()