Killing an Object Prematurely

Sometimes, you need to force an object to destroy itself because its destructor performs an operation needed immediately. For example, when you want to release a mutex or close a file:

   void func(Modem& modem)  {      Mutex mtx(modem); // lock modem      Dial("1234567");      /* at this point, you want to release the 
modem lock by invoking Mutex's dtor */ do_other_stuff(); //modem is still locked } //Mutex dtor called here

After the function Dial() has finished, the modem no longer needs to be locked. However, the Mutex object will release it only when func() exits, and in the meantime, other users will not be able to use the modem. Before you suggest to invoke the destructor explicitly, remember that the destructor will be called once again when func() exits, with undefined behavior:

 void func(Modem& modem){    Mutex mtx(modem); // lock modem    Dial("1234567");    mtx->~Mutex(); // very bad idea!    do_other_stuff(); } //Mutex dtor called here for the second time

There is a simple and safe solution to this. You wrap the critical code in braces:

 void func(Modem& modem) {    {      Mutex mtx(modem); // lock modem      Dial("1234567");    } //mtx destroyed here     //modem is not locked anymore    do_some_other_stuff(); }
Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a