c++ - How to set a default value to flagfile in gflags? -

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i set flagfile this:

declare_string(flagfile); int main(int argc, char** argv) {   flags_flagfile = "./conf/default.conf"   parsecommandlineflags(&argc, &argv, true);   .... }

then change flagfile command line

./main --flagfile=./conf/another.conf

but flagfile still "./conf/default.conf"

how set flagfile's default value , accept changes command line?

you can check parameters before calling parsecommandlineflags function.

for example like:

std::regex flag_regex("--flagfile=(.+.conf)") std::smatch reg_match; if(std::regex_match(std::string(argv[1]), reg_match, flag_regex){    flags_flagfile = reg_match[0]; }

that way use other configuration file. can change regex match differently depending on need.


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