几个简单代码片段-- Google C++ style guide

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，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;
}