What are constexpr templates in C++?
Constexpr templates in C++ allow you to evaluate functions and variables at compile time, improving performance.
Can you give me an example of how to use constexpr templates?
Sure! Here's a simple example:
template <typename T>
constexpr T square(T x) {
return x * x;
}
int main() {
constexpr int result = square(5);
}
This computes the square of 5 at compile time.
What are the benefits of using constexpr?
The benefits include faster execution, reduced runtime overhead, and the ability to use constant expressions in contexts that require compile-time evaluation.
Are there any limitations to constexpr templates?
Yes, constexpr functions must have a single return statement and cannot contain certain constructs like dynamic memory allocation.
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