https://github.com/guonaihong/ccflag
ccflag is a command-line option parsing library written in C++11. It is very simple and easy to use, without any third-party dependencies. ccflag是c++ 11写的命令行选项解析库，非常简单好用，没有任何第三方依赖。
https://github.com/guonaihong/ccflag
Last synced: about 2 months ago
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ccflag is a command-line option parsing library written in C++11. It is very simple and easy to use, without any third-party dependencies. ccflag是c++ 11写的命令行选项解析库，非常简单好用，没有任何第三方依赖。
- Host: GitHub
- URL: https://github.com/guonaihong/ccflag
- Owner: guonaihong
- License: apache-2.0
- Created: 2018-10-09T13:45:22.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2018-10-28T11:48:31.000Z (over 6 years ago)
- Last Synced: 2025-01-30T21:55:06.509Z (4 months ago)
- Language: C++
- Homepage:
- Size: 22.5 KB
- Stars: 0
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
##### ccflag
##### 主要功能和优点如下
* 比```getopt```和```getopt_long```函数写的代码少，还方便维护
* 可以解析int, bool, str, double类型
* 编写扩展类型很简单
##### 主要函数
* 初始化函数(构造函数)
```c++
CCFlagSet::CCFlagSet(string name, //进程名
on_error_type error_handlin //出错时，可以控制是直接退出进程，还是abort，还是return返回g
);
```
* 输出帮助信息(在命令里输出-h 或者--help 会调用，当然用户也可以手动调用)
```c++
void CCFlagSet::usage();
```
* 各种类型勾子函数, 定义需要解析的命令行选项，遇到时自动存放至用户设置的变量里，下面是现在支持的变量类型
* bool
```
void CCFlagSet::bool_var(bool *p, string name, string defvalue, string usage);
```
* int
```c++
void CCFlagSet::int_var(int *p, string name, string defvalue, string usage);
```
* double
``` c++
void CCFlagSet::double_var(double *p, string name, string defvalue, string usage);
```
* string
```c++
void CCFlagSet::string_var(string *p, string name, string defvalue, string usage);
```
* 启动解析(必须要调用的函数)
```c++
// argv命令行参数
string CCFlagSet::parse(char **argv);
```
##### 示例
``` c++
#include "ccflag.h"
class config {
public:
int nt;
bool debug;
string model_path;
double pi;
//unsigned ip;
//unsigned short port;
//struct sockaddr_in addr;
};
int main(int argc, char **argv) {
CCFlagSet commandl_line{argv[0], exit_on_error};
config cnf;
commandl_line.int_var(&cnf.nt, "nt", "0", "(must)Maximum number of threads");
commandl_line.bool_var(&cnf.debug, "debug", "false", "Open the server debug mode");
commandl_line.string_var(&cnf.model_path, "model_path", "./", "xxx engine directory");
commandl_line.double_var(&cnf.pi, "pi", "0", "pi");
commandl_line.parse(argv + 1);
if (cnf.nt == 0) {
commandl_line.usage();
return 1;
}
std::cout << "nt: " << cnf.nt << std::endl;
std::cout << "debug: " << cnf.debug << std::endl ;
std::cout << "model_path: " << cnf.model_path << std::endl ;
std::cout << "pi: " << cnf.pi << std::endl ;
return 0;
}
```
##### 编写扩展类型
ccflag已经自带, int, bool, str, double等多个类型
但是真实世界是复杂的，很可能遇到ccflag自带类型不能满足的需求,这时候就学要自己编写扩展类型了
首先加一个新的成员函数，参考string_var 成员函数，修改lamabda表达式的逻辑
最后调用下var函数，是不是很简单
``` c++
void CCFlagSet::string_var(string *p, string name, string defvalue, string usage) {
auto f = [=](string value) -> bool {
*p = value;
return true;
};
var(p, name, defvalue, usage, f, false, "string");
}
```