aseprite/docs/CODING_STYLE.md

Code Style Guidelines

Basics

Basic statements:

void global_function(int arg1, int arg2,
                     int arg3, ...)
{
  int value;
  const int constValue = 0;

  if (condition) {
    ...
  }

  for (int i=0; i<10; ++i) {
    ...
  }

  while (condition) {
    ...
  }

  do {
    ...
  } while  (condition);

  switch (condition) {
    case 1:
      ...
      break;
    case 2: {
      int varInsideCase;
      ...
      break;
    }
    default:
      break;
  }
}

Namespaces

Define namespaces with lower case:

namespace app {

  ...

} // namespace app

Classes

Define classes with CapitalCase and member functions with camelCase:

class ClassName {
public:
  ClassName();
  virtual ~ClassName();

  int memberVar() const { return m_memberVar; }
  void setMemberVar();

protected:
  void protectedMember();

private:
  int m_memberVar;
};

C++11

We are using some C++11 features, mainly:

• Use nullptr instead of NULL macro
• Use auto for complex types, iterators, or when it's variable type obvious (e.g. auto s = new Sprite;)
• Use range-based for loops (for (const auto& item : values) { ... })
• Use template alias (template<typename T> alias = orig<T>;)
• Use non-generic lambda functions
• Use std::shared_ptr and std::unique_ptr
• Use base::clamp (no std::clamp yet)
• Use static constexpr T v = ...;
• You can use <atomic>, <thread>, <mutex>, and <condition_variable>
• We can use using T = ...; instead of typedef ... T
• We use gcc 9.2 or clang 9.0 on Linux, so check the features available in https://developer.mozilla.org/en-US/docs/Mozilla/Using_CXX_in_Mozilla_code