This is an attempt to learn how to use both find_if and C++ lambda functions to find an element in a collection using an anonymous predictate

find_if_test.cpp

// This can be compiled with a recent g++ (version > 4.5 I belive) by issuing
// $ g++ -std=c++0x -o foo find_if_test.cpp

#include<iostream>
#include<vector>
#include<algorithm>

struct Record
{
    int a;
    int b;
    Record(int a, int b): a(a), b(b) {}
};

int main()
{
    std::vector<Record> records;
    records.push_back(Record(1,2));
    records.push_back(Record(2,3));
    records.push_back(Record(3,4));
    records.push_back(Record(4,5));

    int recordSumThreshold = 6;
    std::vector<Record>::iterator itr = std::find_if(records.begin(), records.end(), [recordSumThreshold](Record r){return (r.a+r.b)>recordSumThreshold;});
    std::cout << "Found Record(" << itr->a << ", " << itr->b << ")" << std::endl;

    return 0;
}