ATL / WTL / STL

Sakthi_Vel wrote:

I am new to ATL. How to display a message box in ATL projects?

Sakthi_Vel wrote:

How to declare/handle strings in ATL?

Sakthi_Vel wrote:

Thanks.

Nemanja Trifunovic wrote:

Another option is to use ATL's CComBSTR[^] class.

double newprice = find_if( OldNewPriceTable.begin(), OldNewPriceTable.end(),
                            bind2nd(NewPriceGrabber<NewPriceLookup, double, bool>(), oldprice));

std::vector<NewPriceLookup>::const_iterator it = std::find_if( OldNewPriceTable.begin(), OldNewPriceTable.end(),
                                                               bind2nd(NewPriceGrabber<NewPriceLookup, double, bool>(), oldprice));

bool NewPriceGrabber(NewPriceLookup const& arg1, double price)
{
   return (arg1.m_oldprice == price);
}

void x()
{
double oldprice = 15.0;
std::vector<NewPriceLookup>::const_iterator it = std::find_if( OldNewPriceTable.begin(), OldNewPriceTable.end(),
                                                               boost::bind(NewPriceGrabber, _1, oldprice)); 
}

• For a simple lookup table, a map would be the preferred container, rather than use a vector of structures:

#include <map>

typedef std::map<double, double> NewPriceLookup;

void x()
{
   double oldprice = 15.0;
   NewPriceLookup npLookup;
   npLookup.insert(std::make_pair(10.0, 12.0));
   npLookup.insert(std::make_pair(12.0, 14.5));
   npLookup.insert(std::make_pair(15.0, 17.0));
   npLookup.insert(std::make_pair(22.0, 26.0));
   npLookup.insert(std::make_pair(30.0, 35.0));
   NewPriceLookup::const_iterator it = npLookup.find(oldprice);
}

If you want to initialise a map, you can use Boost.Assign[^].

• operator() in function objects should generally be defined to take arguments (especially structs/classes) by const reference rather than by value - it minimizes copying. Also, operator() should in general be const-qualified - it's all part of const-correctness.
  

psychedelic_fur wrote:

but anyways I did wanted to learn the usage of find_if method.

psychedelic_fur wrote:

I will also look into Boost libraries once I have a bit more confidence in STL itself.