chromium之ScopedNSAutoreleasePool浅析
上代码,看看注释
ScopedNSAutoreleasePool只有Mac系统特有的,也可以理解为OC特有的函数,
其他系统为空实现
// On the Mac, ScopedNSAutoreleasePool allocates an NSAutoreleasePool when // instantiated and sends it a -drain message when destroyed. This allows an // autorelease pool to be maintained in ordinary C++ code without bringing in // any direct Objective-C dependency. // // On other platforms, ScopedNSAutoreleasePool is an empty object with no // effects. This allows it to be used directly in cross-platform code without // ugly #ifdefs. class ScopedNSAutoreleasePool { public: #if !defined(OS_MACOSX) ScopedNSAutoreleasePool() {} void Recycle() { } #else // OS_MACOSX ScopedNSAutoreleasePool(); ~ScopedNSAutoreleasePool(); // Clear out the pool in case its position on the stack causes it to be // alive for long periods of time (such as the entire length of the app). // Only use then when you're certain the items currently in the pool are // no longer needed. void Recycle(); private: NSAutoreleasePool* autorelease_pool_; #endif // OS_MACOSX private: DISALLOW_COPY_AND_ASSIGN(ScopedNSAutoreleasePool); };