CPP/ReturnByReference

ReturnByReference.cpp

#include <iostream>
#include <vector>
#include <boost/graph/graph_concepts.hpp>
 
class TestClass
{
public:
  TestClass();
 
  void OutputData();
 
  double& GetElement();
 
private:
  std::vector<double> Data;
 
};
 
double& TestClass::GetElement()
{
  return this->Data[1];
}
 
TestClass::TestClass()
{
  this->Data.push_back(0);
  this->Data.push_back(1);
  this->Data.push_back(2);
}
 
void TestClass::OutputData()
{
  for(unsigned int i = 0; i < this->Data.size(); i++)
    {
    std::cout << Data[i] << " ";
    }
}
 
int main(int argc, char *argv[])
{
  TestClass test;
  test.OutputData();
  std::cout << std::endl;
 
  double& element = test.GetElement();
 
  element = 5;
 
  test.OutputData();
 
  return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
 
PROJECT(ReturnByReference)
 
ADD_EXECUTABLE(ReturnByReference ReturnByReference.cpp )