Conditional execution statements. Iteration statements (loops). Jump statements. Functions. Function declaration. Lambda function declaration. inline specifier. Exception specifications (until C++20). noexcept specifier (C++11). Exceptions. Namespaces. Types. Specifiers. Storage duration specifiers.

constexpr is a feature added in C++ 11. constexpr specifies that the value of an object or a function can be evaluated at compile time and the expression can be used in other constant expressions.

constexpr functions are functions that can be executed at compile time. Sounds not so thrilling. But it is. Trust me. You can perform with constexpr functions a lot of calculations at compile time.

Experiments with constexpr. Contribute to elbeno/constexpr development by creating an account on GitHub.

Learn how constexpr and generalized constant expressions make compile time programming easier in C++11. Constexpr - Generalized Constant Expressions in C++11. By Alex Allain.

constexpr variables are const. This will get important when we talk about other effects of const in upcoming lessons. A better way to create symbolic constants is through use of constexpr variables

C++ constexpr functions. Example. A function that is declared constexpr is implicitly inline and calls to such a function potentially yield constant expressions.

Let me share a useful insight with you: constexpr is a platform. Just like you write code that targets Windows or a microcontroller, you write code that targets compile-time execution.

constexpr closure object constexpr auto add5 = adder(5) However with the old if, the other branch still had to compile. With if constexpr that is no longer the case, the compiler will no longer attempt that.

Hmm... constexpr if can be used to replace several tricks that were already done So, in most of the cases, we can now just write a constexpr if statement and that will yield much cleaner code.

Constexpr constructors (C++11). Note: IBM supports selected features of C++11, known as C++0x before its ratification. IBM will continue to develop and implement the features of this standard.

Asserts in constexpr functions. Posted on May 18, 2017 by Andrzej Krzemieński. Assertions (like C-style macro assert) are not an ideal, but still useful tool for indicating assumptions about program...

For example, the constexpr function that has a reinterpret_cast in it, have you used it "Warning, non constant expression used in function <f> marked as constexpr. This is ill formed if used as a constant...

Posted on July 15, 2015July 5, 2015Author momikeyCategories CodeTags c++. One thought on "A simple constexpr power function (C++)".

With C++17 we finally get if constexpr. However, I have started running into a lot of cases where I want a for constexpr that is guaranteed to be evaluated at compile time.