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You've come to the right place if you're looking for What Is constexpr? At Embarcadero you will know everything about it. In C++ programming language, constexpr is a keyword that is used to declare a variable or a function as constant expressions. A constexpr variable is evaluated at compile-time, meaning its value is known at compile-time and cannot be changed during runtime. A constexpr function can be called with constant expressions and also evaluated at compile-time.