Re: [boost] [swap] please update documentation with the header I need to include

Subject: Re: [boost] [swap] please update documentation with the header I need to include
From: Peter Simons (simons_at_[hidden])
Date: 2009-06-29 06:18:31

Daniel James writes:

 >>> [It's] not recommended to do an unqualified call to boost::swap:
 >>>
 >>>   std::string a1[42];
 >>>   std::string a2[42];
 >>>
 >>>   boost::swap(a1, a2);  // Okay.
 >>>
 >>>   using boost::swap;
 >>>   swap(a1, a2);         // Does not compile!
 >>
 >> why do you think this code won't compile? As far as I can tell, ADL
 >> would resolve the call to invoke std::swap().
 >
 > Try it.

 | $ cat >test.cpp <<EOF
 | #include <string>
 | #include <boost/swap.hpp>
 |
 | int main(int, char * [])
 | {
 |   std::string a1[42];
 |   std::string a2[42];
 |
 |   boost::swap(a1, a2);  // Okay.
 |
 |   using boost::swap;
 |   swap(a1, a2);  // Does not compile!
 |
 |   return 0;
 | }
 | EOF
 | $ g++ -pedantic test.cpp && ./a.out && echo okay
 | okay

Peter