Cairo::Device::Lock Class Reference

A convenience class for acquiring a Device object in an exception-safe manner. More...

#include <cairomm/device.h>

Public Member Functions
	Lock (const RefPtr< Device > & device)
	Create a new Device lock for device. More...
	Lock (const Lock & other)
	~Lock ()

Detailed Description

A convenience class for acquiring a Device object in an exception-safe manner.

The device is automatically acquired when a Lock object is created and released when the Lock object is destroyed. For example:

void
my_device_modifying_function (const RefPtr<Device>& device)
{
  // Ensure the device is properly reset
  device->flush();
 
  Device::Lock lock(device);
  // Do the custom operations on the device here.
  // But do not call any Cairo functions that might acquire devices.
 
} // device is automatically released at the end of the function scope

Constructor & Destructor Documentation

Lock() [1/2]

Cairo::Device::Lock::Lock

(

const RefPtr< Device > &

device

)

Create a new Device lock for device.

Lock() [2/2]

Cairo::Device::Lock::Lock

(

const Lock &

other

)

~Lock()

Cairo::Device::Lock::~Lock

(

)

---

The documentation for this class was generated from the following file:

• cairomm/device.h