add 13

02/12/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.12)
+set(CMAKE_CXX_STANDARD 17)
+project(hellocpp LANGUAGES CXX)
+
+add_executable(cpptest main.cpp)

02/12/main.cpp

@@ -0,0 +1,25 @@
+#include <cstdio>
+#include <cstdlib>
+
+struct C {
+    C() {
+        printf("分配内存!\n");
+    }
+
+    ~C() {
+        printf("释放内存!\n");
+    }
+};
+
+int main() {
+    C *p = new C;
+
+    if (rand() != 0) {
+        printf("出了点小状况……\n");
+        // delete p;   // 程序员粗心忘记释放指针
+        return 1;
+    }
+
+    delete p;
+    return 0;
+}

02/12/run.sh

@@ -0,0 +1,5 @@
+set -e
+
+cmake -B build
+cmake --build build
+build/cpptest

02/13/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.12)
+set(CMAKE_CXX_STANDARD 17)
+project(hellocpp LANGUAGES CXX)
+
+add_executable(cpptest main.cpp)

02/13/main.cpp

@@ -0,0 +1,24 @@
+#include <cstdio>
+#include <cstdlib>
+#include <vector>
+
+struct C {
+    C() {
+        printf("分配内存!\n");
+    }
+
+    ~C() {
+        printf("释放内存!\n");
+    }
+};
+
+int main() {
+    std::vector<C> p(1);
+
+    if (rand() != 0) {
+        printf("出了点小状况……\n");
+        return 1;  // 自动释放 p
+    }
+
+    return 0;  // 自动释放 p
+}

02/13/run.sh

@@ -0,0 +1,5 @@
+set -e
+
+cmake -B build
+cmake --build build
+build/cpptest

02/14/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.12)
+set(CMAKE_CXX_STANDARD 17)
+project(hellocpp LANGUAGES CXX)
+
+add_executable(cpptest main.cpp)

02/14/main.cpp

@@ -0,0 +1,24 @@
+#include <cstdio>
+#include <cstdlib>
+#include <vector>
+
+struct C {
+    C() {
+        printf("分配内存!\n");
+    }
+
+    ~C() {
+        printf("释放内存!\n");
+    }
+};
+
+int main() {
+    std::vector<C> p(1);
+
+    if (rand() != 0) {
+        printf("出了点小状况……\n");
+        return 1;  // 自动释放 p
+    }
+
+    return 0;  // 自动释放 p
+}

02/14/run.sh

@@ -0,0 +1,5 @@
+set -e
+
+cmake -B build
+cmake --build build
+build/cpptest