This lesson is a continuation of . Pass by address for “optional” arguments One of the more common uses for pass by address is to allow a function to accept an “optional” argument. This is easier to illustrate by example than to describe: #include <iostream> void printIDNumber(const int *id=nullptr) { …
Before we talk about our first compound type (lvalue references), we’re going to take a little detour and talk about what an lvalue is. In lesson , we defined an expression as “a combination of literals, variables, operators, and function calls that can be executed to produce a singular value”. …
In lesson , we introduced the fundamental data types, which are the basic data types that C++ provides as part of the core language. We’ve made much use of these fundamental types in our programs so far, especially the int data type. And while these fundamental types are extremely useful …
Implicit type conversion Consider the following program: #include <iostream> void print(double x) // print takes a double parameter { std::cout << x << ‘\n’; } int main() { print(5); // what happens when we pass an int value? return 0; } In the above example, the print() function has a …
What is C++20? In February of 2020, the ISO (International Organization for Standardization) approved a new version of C++, called C++20. C++20 contains the most changes to the language since C++11. New improvements in C++20 For your interest, here’s a list of the major changes that C++20 adds. Note that …
In the previous lesson (), we introduced function templates, and converted a normal max() function into a max<T> function template: template <typename T> T max(T x, T y) { return (x < y) ? y : x; } In this lesson, we’ll focus on how function templates are used. Using …
Great job making it this far. The standard conversion rules are pretty complex — don’t worry if you don’t understand every nuance. Chapter Review The process of converting a value from one data type to another data type is called a . (also called or ) is performed whenever one …
In lesson , we wrote a function template to calculate the maximum of two values: #include <iostream> template <typename T> T max(T x, T y) { return (x < y) ? y : x; } int main() { std::cout << max(1, 2) << ‘\n’; // will instantiate max(int, int) std::cout …
In the previous lesson (), we discussed which attributes of a function are used to differentiate overloaded functions from each other. If an overloaded function is not properly differentiated from the other overloads of the same name, then the compiler will issue a compile error. However, having a set of …
In the prior lesson (), we introduced the concept of function overloading, which allows us to create multiple functions with the same name, so long as each identically named function has different parameter types (or the functions can be otherwise differentiated). In this lesson, we’ll take a closer look at …
