gtk:constant-expression-new (gtype value)

gtype -- a g:type-t type ID
value -- a value corresponding to gtype

The new gtk:expression instance.

Creates an expression that evaluates to the object given by the arguments.

(let ((expr (gtk:constant-expression-new "gint" 100)))
  (prog1
    (g:value-int (gtk:constant-expression-value expr))
    (gtk:expression-unref expr)))
=> 100