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inline keyword in C++ is used to suggest to the compiler that it should attempt to generate inline code for a function call, instead of the normal function call mechanism (i.e., jumping to the function's code location). This can improve performance by avoiding the overhead associated with function calls, especially for small functions that are called frequently. this keyword is a reference to the current instance of the class or struct in which it is used. It is used to access the members (fields, properties, methods) of the current object from within its instance methods or constructors. It provides a way to refer to the current object explicitly, which can be useful to disambiguate between class members and method parameters, or to pass the current object as an argument. null in different scenarios. Whether you’re working with null values in the collection itself or as properties of the objects within the collection, LINQ provides mechanisms to deal with these cases. Here's a breakdown of how LINQ handles null values: QObject class, which is the foundation for most of Qt's object-oriented system. Where method. The Where method allows you to specify a condition that the elements in a collection must meet to be included in the result. The filter is applied lazily, meaning the data is filtered when the query is executed (not when it is defined). QEventLoop in managing event processing.