20 #define BM_DEFINE_bool(name, default_val) \  argument
21   bool FLAG(name) = benchmark::BoolFromEnv(#name, default_val)
22 #define BM_DEFINE_int32(name, default_val) \  argument
23   int32_t FLAG(name) = benchmark::Int32FromEnv(#name, default_val)
24 #define BM_DEFINE_double(name, default_val) \  argument
25   double FLAG(name) = benchmark::DoubleFromEnv(#name, default_val)
26 #define BM_DEFINE_string(name, default_val) \  argument
27   std::string FLAG(name) = benchmark::StringFromEnv(#name, default_val)
28 #define BM_DEFINE_kvpairs(name, default_val)      \  argument
30       benchmark::KvPairsFromEnv(#name, default_val)
38 bool BoolFromEnv(const char* flag, bool default_val);
45 int32_t Int32FromEnv(const char* flag, int32_t default_val);
52 double DoubleFromEnv(const char* flag, double default_val);
59 const char* StringFromEnv(const char* flag, const char* default_val);
67     const char* flag, std::map<std::string, std::string> default_val);