argument-dependent-lookup – Page 2

Why doesn’t ADL find function templates?

January 28, 2023 by Tarik

This part explains it: C++ Standard 03 14.8.1.6: [Note: For simple function names, argument dependent lookup (3.4.2) applies even when the function name is not visible within the scope of the call. This is because the call still has the syntactic form of a function call (3.4.1). But when a function template with explicit template … Read more

What is “Argument-Dependent Lookup” (aka ADL, or “Koenig Lookup”)?

October 16, 2022 by Tarik

Koenig Lookup, or Argument Dependent Lookup, describes how unqualified names are looked up by the compiler in C++. The C++11 standard § 3.4.2/1 states: When the postfix-expression in a function call (5.2.2) is an unqualified-id, other namespaces not considered during the usual unqualified lookup (3.4.1) may be searched, and in those namespaces, namespace-scope friend function … Read more