### Function

# GLibunichar_compose

since: 2.30

#### Description

Performs a single composition step of the Unicode canonical composition algorithm.

This function includes algorithmic Hangul Jamo composition,
but it is not exactly the inverse of g_unichar_decompose().
No composition can have either of `a`

or `b`

equal to zero.
To be precise, this function composes if and only if
there exists a Primary Composite P which is canonically
equivalent to the sequence <`a`

,`b`

>. See the Unicode
Standard for the definition of Primary Composite.

If `a`

and `b`

do not compose a new character, `ch`

is set to zero.

See UAX#15 for details.

Available since: 2.30