cpp tests on rpi

cmake_minimum_required(VERSION 3.0)
project(cpp_proj)

# set(CMAKE_CXX_STANDARD 14)

find_package(OpenCV REQUIRED)

add_executable(cpp_proj opencv_cpp.cpp)

include_directories(${OpenCV_INCLUDE_DIRS})
target_link_libraries(cpp_proj ${OpenCV_LIBS})

#include <opencv2/opencv.hpp>
#include <iostream>
#include <string>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>

int main() {
    const std::string img_file{"logo.png"};

    // Check if we can open the file
    cv::Mat input = cv::imread(img_file, 1);
    if(!input.data) {
        std::cout << "Can't open file " << img_file << '\n';
        return -1;
    }

    // Convert to gray
    cv::Mat output;
    cvtColor(input, output, cv::COLOR_BGR2GRAY);

    // Show the original and the result
    cv::namedWindow("Original image", cv::WINDOW_AUTOSIZE);
    cv::imshow("Original image", input);

    cv::namedWindow("Gray image", cv::WINDOW_AUTOSIZE);
    cv::imshow("Gray image", output);

    // Wait until the presses any key
    cv::waitKey(0);

    return 0;
}

#include <iostream>
using namespace std;

int main()
{
   cout << "Hello you" << endl;
   return 0;
}