A convenience class for acquiring a Device object in an exception-safe manner. More...
Public Member Functions | |
Lock (const RefPtr< Device >& device) | |
Create a new Device lock for device. | |
Lock (const Lock& other) | |
~Lock () |
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
Cairo::Device::Lock::Lock | ( | const Lock& | other | ) |
Cairo::Device::Lock::~Lock | ( | ) |