add Chapter06

Chapter06/copy_if.cpp

@@ -0,0 +1,27 @@
+#include <cstdio> 
+#include <vector> 
+#include <array> 
+#include <algorithm> 
+#include <numeric> 
+
+void print_container(const auto& container) { 
+
+    for(auto& elem: container) { 
+       printf("%d ", elem);  
+    } 
+    printf("\r\n");  
+} 
+
+int main() { 
+
+    std::array<int, 10> src{0}; 
+    std::array<int, 10> dst{0}; 
+
+    std::iota(src.begin(), src.end(), 0); 
+    std::copy_if(src.begin(), src.end(), dst.begin(),[] (int x) {return x > 3;}); 
+
+    print_container(src); 
+    print_container(dst); 
+
+    return 0; 
+}