Type Alias xmlXPathVariableLookupFunc

pub type xmlXPathVariableLookupFunc = Option<unsafe extern "C" fn(ctxt: *mut c_void, name: *const xmlChar, ns_uri: *const xmlChar) -> xmlXPathObjectPtr>;

xmlXPathVariableLookupFunc: @ctxt: an XPath context @name: name of the variable @ns_uri: the namespace name hosting this variable

Prototype for callbacks used to plug variable lookup in the XPath engine.

Returns the XPath object value or NULL if not found.

Aliased Type

enum xmlXPathVariableLookupFunc {
    None,
    Some(unsafe extern "C" fn(_: *mut c_void, _: *const u8, _: *const u8) -> *mut _xmlXPathObject),
}

Variants

None

No value.

Some(unsafe extern "C" fn(_: *mut c_void, _: *const u8, _: *const u8) -> *mut _xmlXPathObject)

Some value of type T.