For the memory allocation in class constructors, is it safe to use initializer list for simplifying the expression?

Question

What is the correct syntax to do that? And what should I pay attention when practicing such technique.

Answer 1

... correct syntax to do that?

 class Foo {
     Bar* bar_;
 public:
     Foo() : bar_(new Bar()) {}
 };

And what should I pay attention when practicing such technique.

You should ensure to call delete appropriately

      ~Foo() { delete bar_; }

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The better way though is to use a smart pointer:

 class Foo {
     std::unique_ptr<Bar> bar_;
 public:
     Foo() : bar_(std::make_unique<Bar>()) {}
 };