Discussion: Who’s Up First?
Execute the code to understand the output and gain insights into constructors.
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Run the code
Now, it’s time to execute the code and observe the output.
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#include <iostream>struct Resource{Resource(){std::cout << "Resource constructed\n";}};struct Consumer{Consumer(const Resource &resource){std::cout << "Consumer constructed\n";}};struct Job{Job() : resource_{}, consumer_{resource_} {}Consumer consumer_;Resource resource_;};int main(){Job job;}
Understanding the output
The Job class has two members, consumer_ and resource_, declared in that order. However, in the constructor’s member initializer list (the : resource_{}, consumer_{resource_} part), they are initialized in the opposite order. In which order are they actually initialized?
Member initialization in C++
C++ always initializes members in the order they are declared in the class, not in the order they are listed in the constructor’s member ...