Design patterns implemented in C++

Design patterns (Gang of Four) implemented in C++. These are both standalone patterns and highly intertwined.

You can find here:

creational design patterns
- singleton
  - simple
  - curiously recurring template
- prototype
- abstract factory
- builder
structural design patterns
- adapter
  - class adapter
  - object adapter
- composite
- bridge
- decorator
  - class based
  - lambda based
- proxy
- decorator
- flyweight
behavioural design patterns
- chain of responsibility
- visitor
- observer
- iterator
- template method
- interpreter
- command