lambda trivial example

Author: dimkatsi91

lambdas/lambda_trivial.cpp

@@ -0,0 +1,49 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using std::cout;
+using std::cin;
+using std::endl;
+using std::vector;
+
+/* a lambda function that returns the sum of a vector */
+auto sum = [](const auto& vec) -> auto {
+    auto s = 0.0;
+    for( auto& elem: vec) { 
+        s += elem;
+    }
+    return s;
+};
+
+template<class T>
+class Matrix {
+public:
+    Matrix(vector<T>& vect) { setvec(vect); } 
+    ~Matrix() { vec.clear(); }
+
+    void setvec(vector<T>& source_vector) {
+        typename vector<T>::iterator start = source_vector.begin();
+        while(start != source_vector.end()) {
+            vec.push_back(*start);
+            start++;
+        }
+    }
+    /* vector<T> */ auto Getvec() const { 
+        return vec;
+    }
+private:
+    vector<T> vec; 
+};
+
+
+
+int main()
+{
+    vector<int> vec{1,2,3,4,5};
+    Matrix<int> m(vec);
+
+    cout << "The sum of vec elements is : " << sum(m.Getvec()) << endl;
+
+    return 0;
+}