`%()

`==()

Method `+()

Method `+

mixed `+(mixed arg1)
mixed `+(object arg1, mixed ... extras)
string `+(string arg1, string|int|float arg2)
string `+(int|float arg1, string arg2)
int `+(int arg1, int arg2)
float `+(float arg1, int|float arg2)
float `+(int|float arg1, float arg2)
array `+(array arg1, array arg2)
mapping `+(mapping arg1, mapping arg2)
multiset `+(multiset arg1, multiset arg2)
mixed `+(mixed arg1, mixed arg2, mixed ... extras)

Description

Addition operator.

Returns

If there's only a single argument, that argument will be returned.

If arg1 is an object and it has an lfun::`+, that function will be called with the rest of the arguments, and the result returned.

Otherwise if any of the other arguments is an object that has an lfun::``+ the first such function fill be called with the arguments leading up to it, and `+ be called recursively with the result and the rest of the srguments.

If there are two arguments the result will be:

arg1 can have any of the following types:

string arg2 will be converted to a string, and the result the strings concatenated. int arg2 can have any of the following types: string arg1 will be converted to string, and the result the strings concatenated. int The result will be arg1 + arg2, and will be a float if either arg1 or arg2 is a float. array The arrays will be concatenated. mapping The mappings will be joined. multiset The multisets will be added.

Otherwise if there are more than 2 arguments the result will be: `+(`+(arg1, arg2), @extras)

Note

In Pike 7.0 and earlier the addition order was unspecified.

If arg1 is UNDEFINED it will behave as the empty array/mapping/multiset if needed. This behaviour was new in Pike 7.0.

See also

`-, lfun::`+, lfun::``+

Extracted from Pike v7.3 release 11 at 2001-11-03.