Functions in C++ allow code to be modularized, providing a way to encapsulate and reuse code. Their primary role is to perform a specific task or computation, ensuring the code is organized, clear, and maintainable.

C++ was originally called "C with Classes" before it was named C++. The name reflects the language's evolution as an extension of the C programming language.

unique_ptr is a smart pointer that retains sole ownership of an object. It ensures that there's only one unique_ptr pointing to the object, and it automatically deallocates the object once the unique_ptr goes out of scope.

Recursion in programming refers to a technique where a function calls itself to solve a problem. The main idea is to break the problem down into smaller instances of the same problem. This approach allows for solutions to be built incrementally, mirroring mathematical recursion.

In C++, the logical AND (&&) operator is "short-circuiting". This means if the first operand is false, it won't even check the second operand because the overall result will definitely be false. This behavior can be used for efficient coding practices.

In C++, the keyword to define a function isn't necessarily a specific reserved word like "class" or "struct". Instead, functions begin with their return type, such as "void" for functions that don't return any value. But it's worth noting that "void" is just one possible return type, and not strictly a keyword exclusively for function definition.

In C++, the single equals (=) is an assignment operator, meaning it assigns a value to a variable. The double equals (==) is a comparison operator, which checks for equality. A common mistake is to use a single equals sign instead of a double equals sign when trying to compare values, leading to unexpected behavior.

The C++17 standard, commonly referred to as C++17, was released in 2017. It brought several new features and improvements over the previous standards, streamlining the language and enhancing its capabilities for modern software development.

In C++, to force floating-point division when dividing two integers, you can cast one or both of the integers to a floating-point type (like float or double). By doing this, the division will result in a floating-point value, preserving any fractional part. For instance, (float)5 / 2 would result in 2.5 instead of 2.

Memory alignment requirements can cause "padding" between members of a struct, which can increase the total memory size of the struct. This is essential for data to be accessed in an optimized manner on the hardware.