Here, both constexpr and const are required: constexpr always refers to the expression being declared (here NP), while const refers to int (it declares a pointer-to-const). Removing the …

The goal of constexpr depends on the context: For objects it indicates that the object is immutable and shall be constructed at compile-time. Aside from moving operations to compile-time rather …

Feb 8, 2017 · I am really confused about a constexpr concept, as I have read constexpr is evaluated at compile time, so it is useful for performance optimization versus normal const. …

Is there a difference between the following definitions? const double PI = 3.141592653589793; constexpr double PI = 3.141592653589793; If not, which style is preferred in C++11?

Apr 16, 2017 · What is the difference between if constexpr() and if()? Where and When can I use both of them?

209 Introduction constexpr was not introduced as a way to tell the implementation that something can be evaluated in a context which requires a constant-expression; conforming …

Jun 3, 2025 · constexpr means the function can be evaluated at compile-time if conditions are met (for example, if the object and its members are usable in a constexpr context). const T& …

Where should I prefer using macros and where should I prefer constexpr? Aren't they basically the same? #define MAX_HEIGHT 720 vs constexpr unsigned int max_height = 720;

Jul 15, 2023 · In the answers to this question, (static constexpr vs constexpr in function body?), it is stated that static constexpr puts the variable in the .rodata section, whereas constexpr alone …

Apr 24, 2015 · const = readonly. constexpr = constant. const objects can change, constexpr objects cannot. Top level const cannot change, but functions such as strlen cannot tell the …