update

codingStyleIdioms/3_RAII/c++_example2.cpp

@@ -0,0 +1,32 @@
+//
+// Created by light on 19-12-12.
+//
+#include <iostream>
+#include <vector>
+#include <cstring>
+#include <fstream>
+#include <bits/unique_ptr.h>
+
+using namespace std;
+unique_ptr<vector<string>> read_lines_from_file(string &file_name) {
+    unique_ptr<vector<string>> lines(new vector<string>);
+    string line;
+
+    ifstream file_handle (file_name.c_str());
+    while (file_handle.good() && !file_handle.eof()) {
+        getline(file_handle, line);
+        lines->push_back(line);
+    }
+
+    file_handle.close();
+
+    return lines;
+}
+int main() {
+    // get file name from the first argument
+    string file_name ("/home/light/CLionProjects/Morden_C++/CMakeLists.txt");
+    int count = read_lines_from_file(file_name).get()->size();
+    cout << "File " << file_name << " contains " << count << " lines.";
+    cout<<endl;
+    return 0;
+}