#ifdef __cplusplus
extern "C" {
#endif

typedef enum TF_LogLevel {
  TF_INFO = 0,
  TF_WARNING = 1,
  TF_ERROR = 2,
  TF_FATAL = 3,
} TF_LogLevel;

TF_CAPI_EXPORT extern void TF_Log(TF_LogLevel level, const char* fmt, ...);
TF_CAPI_EXPORT extern void TF_VLog(int level, const char* fmt, ...);
TF_CAPI_EXPORT extern void TF_DVLog(int level, const char* fmt, ...);

#ifdef __cplusplus
}
#endif

static ::tensorflow::string BuildMessage(const char* fmt, va_list args) {
  ::tensorflow::string message;
  ::tensorflow::strings::Appendv(&message, fmt, args);
  return message;
}

void TF_Log(TF_LogLevel level, const char* fmt, ...) {
  if (level < TF_INFO || level > TF_FATAL) return;
  va_list args;
  va_start(args, fmt);
  auto message = BuildMessage(fmt, args);
  va_end(args);
  switch (level) {