Advanced C++ Programming Cookbook

Using the noexcept operator

The noexcept operator is a compile-time check that is used to ask the compiler whether a function is labeled noexcept or not. With C++17, this can be paired with a compile-time if statement (that is, an if statement that is evaluated at compile time and that can be used to add/remove code from an executable during compilation) to change the semantics of a program based on whether or not a function is allowed to throw an exception.

In this recipe, we will explore how to use the noexcept operator in your own code. This operator is important because, in some cases, you may not know whether a function is capable of throwing an exception by simply looking at its definition. For example, if a function uses the noexcept ...