C++: Argument-dependent name lookup
Posted In:
c++
.
By Adriano
Sometimes C++ still surprises me. Consider this code:
namespace ns1
{
class C1
{
};
void f1(const C1&)
{
}
}
int main()
{
ns1::C1 c1;
f1(c1);
return 0;
}
If you think it's wrong and causes a compiler error, you're wrong.
The function "f1" is not in the scope of "main", but its argument has a type of the same namespace, causing the function to be located.
This rule is called Argument-dependent name lookup (or Koenig lookup) and it is also very necessary in relation to operators.
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