Example of Exploring Feature Test Macros

In this example, we use Feature Test Macros to check for the availability of three features: constexpr, the ranges library and structured bindings. Comments are provided alongside each check to explain the purpose of the code block.

In C++, the stage is set for the entry of Feature Test Macros, a potent mechanism ushered in by C++20 to confront these compatibility quandaries head-on. Within this article, we shall embark on an exploration of Feature Test Macros, delve into their conceptual essence, grasp their significance, navigate through tangible examples, and discern their role in the art of composing portable, harmonious C++ code.

Features Test Macros in C++

Feature Test Macros emerge as preprocessor directives that grant you the ability to scrutinize whether a particular language or library feature garners support from the compiler during the compilation process. This avenue furnishes a uniform method for querying the capabilities of the compiler, facilitating a seamless adjustment of your codebase in response.

Through the strategic employment of Feature Test Macros, developers attain the capacity to discern the availability of select features. As a result, this empowers the conditional assembly of code segments contingent upon the existence or absence of specific attributes. The overarching result is the preservation of code functionality across an array of compilers and diverse renditions of the C++ standard.