Log error and return if no devices

src/api/api.cc

@@ -41,17 +41,24 @@ std::shared_ptr<API> API::Create() {
 }
 
 std::shared_ptr<API> API::Create(std::shared_ptr<Device> device) {
+  if (!device)
+    return nullptr;
   return std::make_shared<API>(device);
 }
 
 std::shared_ptr<API> API::Create(int argc, char *argv[]) {
   static glog_init _(argc, argv);
-  return std::make_shared<API>(device::select());
+  auto &&device = device::select();
+  if (!device)
+    return nullptr;
+  return std::make_shared<API>(device);
 }
 
 std::shared_ptr<API> API::Create(
     int argc, char *argv[], std::shared_ptr<Device> device) {
   static glog_init _(argc, argv);
+  if (!device)
+    return nullptr;
   return std::make_shared<API>(device);
 }
 

src/api/api.h

@@ -51,9 +51,35 @@ class MYNTEYE_API API {
   explicit API(std::shared_ptr<Device> device);
   /*virtual*/ ~API();
 
+  /**
+   * Create the API instance.
+   * @return the API instance.
+   * @note This will call device::select() to select a device.
+   */
   static std::shared_ptr<API> Create();
+  /**
+   * Create the API instance.
+   * @param device the selected device.
+   * @return the API instance.
+   */
   static std::shared_ptr<API> Create(std::shared_ptr<Device> device);
+  /**
+   * Create the API instance.
+   * @param argc the arg count.
+   * @param argv the arg values.
+   * @return the API instance.
+   * @note This will init glog with args and call device::select() to select a
+   * device.
+   */
   static std::shared_ptr<API> Create(int argc, char *argv[]);
+  /**
+   * Create the API instance.
+   * @param argc the arg count.
+   * @param argv the arg values.
+   * @param device the selected device.
+   * @return the API instance.
+   * @note This will init glog with args.
+   */
   static std::shared_ptr<API> Create(
       int argc, char *argv[], std::shared_ptr<Device> device);
 

src/public/utils.cc

@@ -28,7 +28,10 @@ std::shared_ptr<Device> select() {
   auto &&devices = context.devices();
 
   size_t n = devices.size();
-  LOG_IF(FATAL, n <= 0) << "No MYNT EYE devices :(";
+  if (n <= 0) {
+    LOG(ERROR) << "No MYNT EYE devices :(";
+    return nullptr;
+  }
 
   LOG(INFO) << "MYNT EYE devices:";
   for (size_t i = 0; i < n; i++) {