pub unsafe extern "C" fn gst_validate_utils_parse_expression(
expr: *const c_char,
variable_func: GstValidateParseVariableFunc,
user_data: gpointer,
error: *mut *mut c_char,
) -> c_double
pub unsafe extern "C" fn gst_validate_utils_parse_expression(
expr: *const c_char,
variable_func: GstValidateParseVariableFunc,
user_data: gpointer,
error: *mut *mut c_char,
) -> c_double