What are some real-world examples of C++20 templates?

What are some real-world examples of C++20 templates?

C++20 templates can be used in various scenarios, such as creating generic data structures, implementing type-safe containers, and enabling compile-time polymorphism. For instance, you can use templates to create a Vector class that can store any data type.

Can you give me a specific example of a template in action?

Sure! Consider a simple add function template that can add two values of any type. Here's how it looks:

template <typename T>
T add(T a, T b) {
    return a + b;
}

You can call this function with integers, floats, or even custom types that support the + operator.

How do concepts improve template programming in C++20?

Concepts allow you to specify constraints on template parameters, making your templates safer and easier to use. For example, you can define a concept that ensures a type supports addition before allowing it in your add function template.

What are some common pitfalls when using templates?

Common pitfalls include template bloat, where excessive instantiation leads to larger binaries, and complex error messages that can arise from template misuse. It's essential to keep templates simple and well-documented.