package lru_memory_cache type Config struct { capacity uint } type ConfigOption func(*Config) type ConfigOptions []ConfigOption func (s *ConfigOptions) Add(option ConfigOption) { *s = append(*s, option) } func NewConfig(opts ...ConfigOption) Config { c := &Config{} for _, opt := range opts { opt(c) } return *c } func WithCapacity(capacity uint) ConfigOption { return func(s *Config) { s.capacity = capacity } }