GOOGLE LOG学习(140)

发表于   |   分类于
今日空闲，却也看了下protocolbuffer的代码，发现一个google log模块很有意思，记录下来++
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
DECLARE_STREAM_OPERATOR(char         , "%c" )
DECLARE_STREAM_OPERATOR(int          , "%d" )
DECLARE_STREAM_OPERATOR(uint         , "%u" )
DECLARE_STREAM_OPERATOR(long         , "%ld")
DECLARE_STREAM_OPERATOR(unsigned long, "%lu")
DECLARE_STREAM_OPERATOR(double       , "%g" )
common.cc 173
#define GOOGLE_LOG(LEVEL)                                                 \有等级，警告，错误，严重等
  ::google::protobuf::internal::LogFinisher() =                           \
    ::google::protobuf::internal::LogMessage(                             \
      ::google::protobuf::LOGLEVEL_##LEVEL, __FILE__, __LINE__)
#define GOOGLE_LOG_IF(LEVEL, CONDITION) \
  !(CONDITION) ? (void)0 : GOOGLE_LOG(LEVEL)
#define GOOGLE_CHECK(EXPRESSION) \
  GOOGLE_LOG_IF(FATAL, !(EXPRESSION)) << "CHECK failed: " #EXPRESSION ": "
//////////////////////////////////在下的示例代码///////////////////////////
	struct dd
{
public:
	dd(string a){
		m_ = a;
		cout << a<<endl;
	};~dd(){
		cout<< "is end:,,,,,,,,,,"<<endl;
		cout << m_<<endl<<d_<<endl;
	};
	dd&	operator<< (string d){
		d_ = d;
		cout <<m_<<endl<< d<<endl;
		return *this;
	}
protected:
	string m_;
	string d_;
private:
};
#define LEVEL_ERROR "error"
#define ERROR
#define HP(a) dd(LEVEL_##b)
#define AH(a, b) a ? (void)0:dd(LEVEL_##b) //只是这里若再取一遍宏，便出错了；确实宏嵌套太多了。
#define A(c) AH(c>0, ERROR) << "hehe"

如此log，在函数中使用，当然google封装了更多的东西，比如checklog呀。在构造上记录基本信息，operator上记录tips，析构里进行log文件写入。很好

#define DO(STATEMENT) if (STATEMENT) {} else return false   这个宏。。。差点忘了，这个宏也是非常优秀的
// //