Understanding Default Initialization

A POD (plain old data) type is a union, struct or class with no user-declared constructors, no private or protected non-static data members, no base classes, and no virtual functions. To default-initialize an object of type T means the following:if T is a non-POD class type, the default constructor for T is called. If T is an array type, each element is default-initialized. Otherwise, the storage for the object is zero-initialized.

An object whose initializer is an empty set of parentheses, i.e., (), shall be default-initialized. For example:

   struct Date // POD type  {    int day;    int month;    int year;  };  Date d = Date();  // default initialize d

Because d is of a POD type, the explicit default initialization of d initializes all of its members to 0. However, the default initialization rule was added recently to C++, so at present, very few compilers implement it. Therefore, you should use an explicit initialization list to ensure that d is zero-initialized:

   Date d = {0}; // guarantee zero initialization
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