Function IsType

cmp/internal/function/func.go:41–73

IsType reports whether the reflect.Type is of the specified function type.

(t reflect.Type, ft funcType)

// IsType reports whether the reflect.Type is of the specified function type.
func IsType(t reflect.Type, ft funcType) bool {
	if t == nil || t.Kind() != reflect.Func || t.IsVariadic() {
		return false
	}
	ni, no := t.NumIn(), t.NumOut()
	switch ft {
	case tbFunc: // func(T) bool
		if ni == 1 && no == 1 && t.Out(0) == boolType {
			return true
		}
	case ttbFunc: // func(T, T) bool
		if ni == 2 && no == 1 && t.In(0) == t.In(1) && t.Out(0) == boolType {
			return true
		}
	case ttiFunc: // func(T, T) int
		if ni == 2 && no == 1 && t.In(0) == t.In(1) && t.Out(0) == intType {
			return true
		}
	case trbFunc: // func(T, R) bool
		if ni == 2 && no == 1 && t.Out(0) == boolType {
			return true
		}
	case tibFunc: // func(T, I) bool
		if ni == 2 && no == 1 && t.In(0).AssignableTo(t.In(1)) && t.Out(0) == boolType {
			return true
		}
	case trFunc: // func(T) R
		if ni == 1 && no == 1 {
			return true
		}
	}
	return false
}

var lastIdentRx = regexp.MustCompile(`[_\p{L}][_\p{L}\p{N}]*$`)