几个简单代码片段-- Google C++ style guide

蔚落 2022-09-23 03:38 167阅读 0赞

欧洲杯，德国VS意大利。战车遇到浪漫之师，结果如何？  
Who Cares!!!

开球之前，review一下近期写的代码，发现一些代码写的不是很规范。于是，重新温习一下 Google C++ style guide。

之前博客有过介绍，[谷歌C++编程规范笔记][C]，现在只是用几个简单的代码片段展示一下。

**定义常量、宏定义、枚举：**

// 使用下划线分隔
    #define FLAG_FOO 0x0
    
    // 要有括号
    #define FLAG_BAZ (0x1 << 3)
    
    // 对于常量，使用k
    const int kStateFoo = 0;
    
    
    typedef struct linked_list LinkedList;
    
    // 枚举跟宏定义类似
    typedef enum {
      MODE_FOO,
      MODE_BAR,
      MODE_BAZ,
      MODE_QUX
    } Mode;
    
    // 枚举也可以像常量一样
    typedef enum {
      kStateFoo,
      kStateBar,
      kStateBaz,
      kStateQux
    } State;
    
    typedef struct sample {
      int first_field;
      bool second_field;
      Mode mode;
      State state;
      struct sample *next;
    } Sample;

**函数：**

//注意第一个大括号的位置
    bool SampleEqual(Sample *self, Sample *other) {
      // Local variables are lower_case and separated by underscores.
      if (self == NULL && other == NULL) {
        return true;
      }
    
      if (self == NULL || other == NULL) {
        return false;
      }
    
      //多行
      if (self->first_field == other->first_field &&
          self->second_field == other->second_field &&
          self->state == other->state &&
          self->mode == other->mode &&
          self->next == other->next) {
        return true;
      }
    
      return false;
    }
    
    //多个参数
    Sample *SampleNew(int first_field,
                      bool second_field,
                      Mode mode,
                      State state,
                      Sample *next) {
      Sample *sample = (Sample *) malloc(sizeof(*sample));
      if (sample == NULL) {
        return NULL;
      }
    
      memset(sample, 0, sizeof(sample));
      sample->first_field = first_field;
      sample->second_field = second_field;
      sample->mode = mode;
      sample->state = state;
      sample->next = next;
      return sample;
    }
    
    Sample *SampleClone(Sample *sample) {
      if (sample == NULL) {
        return NULL;
      }
    
      return SampleNew(sample->first_field,
                       sample->second_field,
                       sample->mode,
                       sample->state,
                       sample->next);
    }
    
    
    static void SampleDoSomethingWithALongName(
        Sample *sample,
        int parameter_with_a_long_name,
        bool another_parameter,
        int another_parameter) {
      if (sample == NULL) {
        return;
      }
    
      bool local_variable;
      if (parameter_with_a_long_name == kStateFoo) {
        local_variable = true;
      } else {
        local_variable = false;
      }
      sample->first_parameter += another_parameter;
      sample->second_parameter |= local_variable;
    }

[C]: http://blog.csdn.net/wangshubo1989/article/details/49081977