Design patterns Singleton Singleton (C++)
Example
As per Wiki : In software engineering, the singleton pattern is a design pattern that restricts the instantiation of a class to one object.
This is required to create exactly one object to coordinate actions across the system.
class Singleton
{
// Private constructor so it can not be arbitrarily created.
Singleton()
{}
// Disable the copy and move
Singleton(Singleton const&) = delete;
Singleton& operator=(Singleton const&) = delete;
public:
// Get the only instance
static Singleton& instance()
{
// Use static member.
// Lazily created on first call to instance in thread safe way (after C++ 11)
// Guaranteed to be correctly destroyed on normal application exit.
static Singleton _instance;
// Return a reference to the static member.
return _instance;
}
};
