Function NewFunction

common/decls/decls.go:36–53

NewFunction creates a new function declaration with a set of function options to configure overloads and function definitions (implementations). Functions are checked for name collisions and singleton redefinition.

(name string, opts ...FunctionOpt)

//
// Functions are checked for name collisions and singleton redefinition.
func NewFunction(name string, opts ...FunctionOpt) (*FunctionDecl, error) {
	fn := &FunctionDecl{
		name:             name,
		overloads:        map[string]*OverloadDecl{},
		overloadOrdinals: []string{},
	}
	var err error
	for _, opt := range opts {
		fn, err = opt(fn)
		if err != nil {
			return nil, err
		}
	}
	if len(fn.overloads) == 0 {
		return nil, fmt.Errorf("function %s must have at least one overload", name)
	}
	return fn, nil
}

// FunctionDecl defines a function name, overload set, and optionally a singleton definition for all
// overload instances.