If you have virtual members that are going to be invoked during construction (against best advice, but we’ve already agreed on that), then you need to move your initialization into a separate method, that can protect itself against multiple calls (i.e. if init has already happened, return immediately). That method will then be invoked by … Read more
You have three options to update singleton bean in spring context, you can chose one suitable for your use case: Reload method In the Bean Create a method in your bean which will update/reload its properties. Based on your trigger, access the bean from spring context, and then call the reload method to update bean … Read more
It the first member of your struct has a scalar type, use STRUCTA array[MAX] = {{ 0 }}; If the first member of your struct happens to be another struct object, whose first member has scalar type, then you’ll have to use STRUCTA array[MAX] = {{{ 0 }}}; and so on. Basically, you have to … Read more
It’s the initial capacity, i.e. the number of items that ArrayList will allocate to begin with as the internal storage of items. ArrayList can contain “any number of items” (as long you have the memory for it) and when doing large initial insertions you can tell ArrayList to allocate a larger storage to begin with … Read more
Before we start: Let me point out that a lot of the confusion around this syntax comes because in both C and C++ you can use the = {0} syntax to initialize all members of a C-style array to zero! See here: https://en.cppreference.com/w/c/language/array_initialization. So, this works: // z has type int[3] and holds all zeroes, … Read more
The order is the order they appear in the class definition – this is from section 12.6.2 of the C++ Standard: 5 Initialization shall proceed in the following order: — First, and only for the constructor of the most derived class as described below, virtual base classes shall be initialized in the order they appear … Read more
For (non-nullable) object types, Kotlin uses the null value to mark that a lateinit property has not been initialized and to throw the appropriate exception when the property is accessed. For primitive types, there is no such value, so there is no way to mark a property as non-initialized and to provide the diagnostics that … Read more
A declared variable can be Zero Initialized, Value Initialized or Default Initialized. The C++03 Standard 8.5/5 aptly defines each: To zero-initialize an object of type T means: — if T is a scalar type (3.9), the object is set to the value of 0 (zero) converted to T; — if T is a non-union class … Read more
The body of a class or an object is the primary constructor. A constructor, like a method, is a sequence of statements that are executed in order — to do anything else, it would have to be a very different language. I’m pretty sure you wouldn’t like for Scala to execute the statements of your … Read more
You can use a thread in combination with move semantics: class MyClass final { private: std::thread mythread; void _ThreadMain(); public: MyClass() : mythread{} // default constructor { // move assignment mythread = std::thread{&MyClass::_ThreadMain, this}; } }; The move assignment operator is documented on the following page. In particular, it is noexcept and no new thread … Read more