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gflags sample
#include <iostream>
#include <string>
#include <gflags/gflags.h>
DEFINE_bool(a_bool_flag, true, "A Bool Flag");
DEFINE_string(ipaddr, "127.0.0.1", "IPAddress String");
DEFINE_int32(portno, 4000, "Port NO.");
static bool ipaddr_validator(
const char* flagname,
const std::string& ipaddr) {
if (ipaddr.size() >= 7 && ipaddr.size() <= 15) {
return true;
}
std::cerr << flagname << std::endl;
std::cerr << "Invalid IP address: " << ipaddr << std::endl;
return false;
}
static bool port_validator(
const char* flagname,
google::int32 portno) {
if (portno > 0 && portno < 65536) {
return true;
}
std::cerr << flagname << std::endl;
std::cerr << "Invalid port: " << portno << std::endl;
return false;
}
void func_use_flags() {
std::cout << FLAGS_a_bool_flag << std::endl;
std::cout << FLAGS_ipaddr << std::endl;
std::cout << FLAGS_portno << std::endl;
}
int main(int argc, char* argv[]) {
std::cout << google::RegisterFlagValidator(&FLAGS_ipaddr, &ipaddr_validator) << std::endl;;
std::cout << google::RegisterFlagValidator(&FLAGS_portno, &port_validator) << std::endl;
std::cout << "before ParseCommandLineFlags. argc : " << argc << std::endl;
for (int i = 0; i < argc; ++i) {
std::cout << "argv[" << i << "] : " << argv[i] << std::endl;
}
int r = google::ParseCommandLineFlags(&argc, &argv, false);
std::cout << r << std::endl;
std::cout << "after ParseCommandLineFlags. argc : " << argc << std::endl;
for (int i = 0; i < argc; ++i) {
std::cout << "argv[" << i << "] : " << argv[i] << std::endl;
}
func_use_flags();
return 0;
}
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