Hey everybody,
Could somebody please provide an example for using the STL find_if for the following task. I am trying to search a vector of structs, using the following criteria: compare whether the key of the struct in the vector matches the key of another struct (instace of the same type of struct) that I want to find. So basically search the vector for a particular struct. I want to use find_if, in order to replace the handwritten routine I have now. I have seen many complex, examples online. If anybody knows of simple and clean way, please share. Thanks in advance.

Member Avatar for iamthwee

Loop through the vector of objects, if that object matches the one in hand return a success message?

#include <vector>
#include <algorithm>

struct some_struct { int key ; /* ... */ };

struct has_same_key
  explicit ( const some_struct& s ) : what(s) {}
  bool operator() ( const some_struct& elem ) const
  { return elem.key == what.key ; }
  const some_struct& what ;

inline std::vector<some_struct>::const_iterator 
   do_find( const std::vector<some_struct>& vec, const some_struct& what )
  return std::find_if( vec.begin(), vec.end(), has_same_key(what) ) ;
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