How do I avoid ADL pitfalls (argument-dependent lookup)?

Argument-Dependent Lookup (ADL) is a feature in C++ that can lead to potential pitfalls if not handled carefully. ADL occurs when the compiler considers functions that are defined in the same namespace as the types of the function arguments, even if they are not explicitly qualified. This can lead to unexpected function calls and ambiguities, particularly when using namespaces extensively. Here are some strategies to avoid ADL pitfalls:

1. Namespace Qualification: Always use fully qualified names for functions to ensure that the correct function is called.
2. Use 'using' Directives Wisely: Avoid using 'using namespace' in header files as it can introduce ambiguities in function calls.
3. Explicit Function Overloading: Be cautious when overloading functions in different namespaces as it can confuse the compiler during lookup.
4. Namespace Isolation: Keep your functions in a specific namespace to limit their visibility and prevent ADL issues.

By following these strategies, you can minimize the risk of unexpected behaviors caused by ADL in your C++ code.