How can you enforce constraints on template parameters in C before C 11?

Template Constraints in C

Generalizing code for different data types using templates is a common practice in C . However, in some scenarios, it is necessary to impose constraints on the types that can be used as template parameters. In this article, we will explore how to achieve this in current C standards before C 11.

Constraint Enforcement

In C , unlike C#, there is no straightforward way to enforce constraints on template parameters. However, there are techniques that can achieve similar functionality.

Static Assertions with std::is_base_of

With the introduction of C 11, static_assert can be used in conjunction with std::is_base_of to perform compile-time checks on template parameters. For instance, consider the following example:

<code class="cpp">#include <type_traits>

template<typename T>
class YourClass {
    YourClass() {
        // Compile-time check
        static_assert(std::is_base_of<BaseClass, T>::value, "type parameter of this class must derive from BaseClass");

        // ...
    }
};</code>

This technique ensures that the template parameter T must be a derived class of BaseClass at compile time. If this condition is not met, the compiler will generate an error at compilation time, preventing the code from running with invalid template parameters.

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