Re: [Boost-users] Using lambda expressions in stl algorithms

14 Dec 2010


      AMDG

On 12/14/2010 6:49 AM, przemyslaw.sliwa@uk.bnpparibas.com wrote:
...
Could someone tell me why this code does not compile? Can it be modified
in order to compile?
struct CcyCplEventKey
         {
                 CurrencyCouple  CcyCpl;
                 EventType               Event;
         }
typedef std::map<CurrencyEventKey, CurrencyEventPtr>  mapType;
mapType ccyOut;
std::for_each(ccyOut.begin(), ccyOut.end(),
(&*boost::lambda::_1)->*&CcyCplEventKey::Event);
boost::lambda::_1 gets replaced with an object of type
std::pair<const CurrencyEventKey, CurrencyEventPtr>.

a) std::pair can't be dereferenced.
b) Even if it could be, you can't call a member function of CcyCplEventKey
     with a std::pair.
c) Accessing a data member has no side-effects.  The
     for_each doesn't do anything, so I don't know what
     you're trying to accomplish.

In Christ,
Steven Watanabe