[c++] Review coding skills for production by KKB ***

夯实基础，对齐概念

 

 

类的左值引用

打印类

IO 操作符通常对非公用数据成员进行读写,因此,类通常将 IO操作符设为友元。

friend ostream &operator<<(ostream &out, const Point &p)

 

 

命名空间

using std::endl
using std::ostream;

 

 

四种范式

在本例子中依次得到体现：

1. Procedure-oriented

2. Object-oriented

3. Multi-paradigm programming

4. Functional Programming 

 #include <string>
 #include <map>
 #include <set>
 #include <vector>
 
 using namespace std;
 
 int add1(int a, int b) {
     return a + b;
 }
 
 class ADD {
 public:
     int operator()(int a, int b) {
         return a + b;
     }
 };
 
 template<typename T, typename U>
 auto add3(T a, U b) -> decltype(a+b) {
     return a + b;
 }
 
 auto add4 = [](int a, int b) -> int {
     return a + b;
 };
 
 int main() {
     ADD add2;
     cout << add1(3, 4) << endl;
     cout << add2(3, 4) << endl;
     cout << add3(3, 4) << endl;
     cout << add4(3, 4) << endl;
 
     return 0;
 }

 

 

编译与链接

nm -C other.o

例如，本文件有定义该函数，自然有一个地址。

 

 

Google测试框架

编译git clone的代码。

googletest/build$ make

Scanning dependencies of target gtest
[ 12%] Building CXX object googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o
[ 25%] Linking CXX static library ../lib/libgtest.a
[ 25%] Built target gtest

Scanning dependencies of target gmock
[ 37%] Building CXX object googlemock/CMakeFiles/gmock.dir/src/gmock-all.cc.o
[ 50%] Linking CXX static library ../lib/libgmock.a
[ 50%] Built target gmock

Scanning dependencies of target gmock_main
[ 62%] Building CXX object googlemock/CMakeFiles/gmock_main.dir/src/gmock_main.cc.o
[ 75%] Linking CXX static library ../lib/libgmock_main.a
[ 75%] Built target gmock_main

Scanning dependencies of target gtest_main
[ 87%] Building CXX object googletest/CMakeFiles/gtest_main.dir/src/gtest_main.cc.o
[100%] Linking CXX static library ../lib/libgtest_main.a
[100%] Built target gtest_main

 

彩色打印：

int main() {

　　printf("\033[0;1;33;41mhello world\033[0m\n");
　　printf("\033[0;1;32madd(3,4) = %d\n", add(3, 4));
       return 0;
}