What is the difference between const and constexpr in C++?
In C++, const
is used to declare variables whose value cannot be changed after initialization, while constexpr
is used for variables that are evaluated at compile time.
Can you give me an example of using constexpr?
Sure! Here's an example:
constexpr int square(int x) {
return x * x;
}
constexpr int result = square(5);
This defines a function that computes the square of a number at compile time.
Are there any limitations to using constexpr?
Yes, constexpr
functions must have a return type and contain only a single return statement or be defined in a way that can be evaluated at compile time.
Can I use constexpr with classes?
Yes, you can use constexpr
with classes. You can define constexpr
member functions and even constexpr
constructors starting from C++11.
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