ent)
			}
		}
	case reflect.Slice:
		if !dst.CanSet() {
			break
		}
		if !isEmptyValue(src) && (overwrite || isEmptyValue(dst)) && !config.AppendSlice {
			dst.Set(src)
		} else if config.AppendSlice {
			if src.Type() != dst.Type() {
				return fmt.Errorf("cannot append two slice with different type (%s, %s)", src.Type(), dst.Type())
			}
			dst.Set(reflect.AppendSlice(dst, src))
		}
	case reflect.Ptr:
		fallthrough
	case reflect.Interface:
		if src.IsNil() {
			break
		}
		if src.Kind() != reflect.Interface {
			if dst.IsNil() || overwrite {
				if dst.CanSet() && (overwrite || isEmptyValue(dst)) {
					dst.Set(src)
				}
			} else if src.Kind() == reflect.Ptr {
				if err = deepMerge(dst.Elem(), src.Elem(), visited, depth+1, config); err != nil {
					return
				}
			} else if dst.Elem().Type() == src.Type() {
				if err = deepMerge(dst.Elem(), src, visited, depth+1, config); err != nil {
					return
				}
			} else {
				return ErrDifferentArgumentsTypes
			}
			break
		}
		if dst.IsNil() || overwrite {
			if dst.CanSet() && (overwrite || isEmptyValue(dst)) {
				dst.Set(src)
			}
		} else if err = deepMerge(dst.Elem(), src.Elem(), visited, depth+1, config); err != nil {
			return
		}
	default:
		if dst.CanSet() && !isEmptyValue(src) && (overwrite || isEmptyValue(dst)) {
			dst.Set(src)
		}
	}
	return
}

// Merge will fill any empty for value type attributes on the dst struct using corresponding
// src attributes if they themselves are not empty. dst and src must be valid same-type structs
// and dst must be a pointer to struct.
// It won't merge unexported (private) fields and will do recursively any exported field.
func Merge(dst, src interface{}, opts ...func(*Config)) error {
	return merge(dst, src, opts...)
}

// MergeWithOverwrite will do the same as Merge except that non-empty dst attributes will be overriden by
// non-empty src attribute values.
// Deprecated: use Merge(…) with WithOverride
func MergeWithOverwrite(dst, src interface{}, opts ...func(*Config)) error {
	return merge(dst, src, append(opts, WithOverride)...)
}

// WithTransformers adds transformers to merge, allowing to customize the merging of some types.
func WithTransformers(transformers Transformers) func(*Config) {
	return func(config *Config) {
		config.Transformers = transformers
	}
}

// WithOverride will make merge override non-empty dst attributes with non-empty src attributes values.
func WithOverride(config *Config) {
	config.Overwrite = true
}

// WithAppendSlice will make merge append slices instead of overwriting it
func WithAppendSlice(config *Config) {
	config.AppendSlice = true
}

func merge(dst, src interface{}, opts ...func(*Config)) error {
	var (
		vDst, vSrc reflect.Value
		err        error
	)

	config := &Config{}

	for _, opt := range opts {
		opt(config)
	}

	if vDst, vSrc, err = resolveValues(dst, src); err != nil {
		return err
	}
	if vDst.Type() != vSrc.Type() {
		return ErrDifferentArgumentsTypes
	}
	return deepMerge(vDst, vSrc, make(map[uintptr]*visit), 0, config)
}