consolidate all repos to one for archive

semester_2/programiranje_2/primeri/Example26/main.cpp

@@ -0,0 +1,82 @@
+#include <iostream>
+
+bool condEq5 ( int x ) {
+    return x==5;
+}
+
+bool condRange100 ( int x ) {
+    return (x>=0) && (x<=100);
+}
+
+int* find2 ( int* pool, int n, bool (*c)(int) ) {
+    int* p = pool;
+    for ( int i = 0; i<n; i++ ) {
+        if ( c(*p) ) return p;
+        p++;
+    }
+    return nullptr;
+}
+/*
+// functional type
+class GreaterThan5 {
+public:
+    bool operator()(int x) { return x>5; }
+};
+
+int* find2 ( int* pool, int n, GreaterThan5 c ) {
+    int* p = pool;
+    for ( int i = 0; i<n; i++ ) {
+        if ( c(*p) ) return p;   // c.operator()(*p)
+        p++;
+    }
+    return nullptr;
+}
+*/
+/*
+template < typename T, typename Comparator >
+T* find2 ( T* pool, int n, Comparator c ) {
+    T* p = pool;
+    for ( int i = 0; i<n; i++ ) {
+        if ( c(*p) ) return p;
+        p++;
+    }
+    return 0;
+}
+
+// different comparators
+template < typename T, T N >
+class Greater {
+public:
+    bool operator()(T x) { return x>N; }
+};
+*/
+
+int main() {
+    int arr[] = {1, 3, 5, 7, 9};
+    int* p = find2(arr,5, condEq5);
+    //int* p = find2(arr,5, [](int x) -> bool {return x==5;});   // lambda expression
+    std::cout << p << " " << *p << " : an array element is at index: " << p - arr << std::endl;
+    p = find2(arr,5,condRange100);
+    std::cout << p << " " << *p << " : an array element is at index: " << p - arr << std::endl;
+/*
+    bool (*pf)(int) = condEq5;   // pointer to function
+    std::cout << condEq5(2) << std::endl;  // explicit function call
+    std::cout << pf(2) << std::endl;         // implicit function call
+    pf = condRange100;
+    p = find2(arr,5,pf);
+    std::cout << p << " " << *p << " : an array element is at index: " << p - arr << std::endl;
+*/
+/*
+    std::cout << "-------------------" << std::endl;
+    GreaterThan5 c; // c is functional object
+    p = find2(arr,5, c);
+    std::cout << p << " " << *p << " : an array element is at index: " << p - arr << std::endl;
+
+    std::cout << "-------------------" << std::endl;
+    Greater<int,7> a;
+     = find2(arr,5, a);
+    //p = find2(arr,5, Greater<int,7>());  //calling defualt constructor
+    std::cout << p << " " << *p << " : an array element is at index: " << p-arr << std::endl;
+*/
+    return 0;
+}