COMPMID-1008: Fix Doxygen issues

Change-Id: Ie73d8771f85d1f5b059f3a56f1bbd73c98e94a38
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/124723
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/utils/logging/LoggerRegistry.h b/arm_compute/core/utils/logging/LoggerRegistry.h
index d3c6911..066a42f 100644
--- a/arm_compute/core/utils/logging/LoggerRegistry.h
+++ b/arm_compute/core/utils/logging/LoggerRegistry.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -51,7 +51,7 @@
      * @note Some names are reserved e.g. [CORE, RUNTIME, GRAPH]
      *
      * @param[in] name      Logger's name
-     * @param[in] log_level Logger's log level. Defaults to @ref LogLevel::INFO
+     * @param[in] log_level Logger's log level. Defaults to INFO
      * @param[in] printers  Printers to attach to the system loggers. Defaults with a @ref StdPrinter.
      */
     void create_logger(const std::string &name, LogLevel log_level = LogLevel::INFO,
@@ -70,7 +70,7 @@
     std::shared_ptr<Logger> logger(const std::string &name);
     /** Creates reserved library loggers
      *
-     * @param[in] log_level (Optional) Logger's log level. Defaults to @ref LogLevel::INFO
+     * @param[in] log_level (Optional) Logger's log level. Defaults to INFO
      * @param[in] printers  (Optional) Printers to attach to the system loggers. Defaults with a @ref StdPrinter.
      */
     void create_reserved_loggers(LogLevel                              log_level = LogLevel::INFO,
diff --git a/arm_compute/core/utils/logging/Types.h b/arm_compute/core/utils/logging/Types.h
index 0b40e3d..d567843 100644
--- a/arm_compute/core/utils/logging/Types.h
+++ b/arm_compute/core/utils/logging/Types.h
@@ -31,7 +31,7 @@
 namespace logging
 {
 /** Logging level enumeration */
-enum class LogLevel : unsigned int
+enum class LogLevel
 {
     VERBOSE, /**< All logging messages */
     INFO,    /**< Information log level */
@@ -40,19 +40,28 @@
     OFF      /**< No logging */
 };
 
+/** Log message */
 struct LogMsg
 {
+    /** Default constructor */
     LogMsg()
         : raw_(), log_level_(LogLevel::OFF)
     {
     }
+    /** Construct a log message
+     *
+     * @param[in] msg       Message to log.
+     * @param[in] log_level Logging level. Default: OFF
+     */
     LogMsg(std::string msg, LogLevel log_level = LogLevel::OFF)
         : raw_(msg), log_level_(log_level)
     {
     }
 
+    /** Log message */
     std::string raw_;
-    LogLevel    log_level_;
+    /** Logging level */
+    LogLevel log_level_;
 };
 } // namespace logging
 } // namespace arm_compute
diff --git a/arm_compute/core/utils/misc/CRTP.h b/arm_compute/core/utils/misc/CRTP.h
index 9947312..8c39af1 100644
--- a/arm_compute/core/utils/misc/CRTP.h
+++ b/arm_compute/core/utils/misc/CRTP.h
@@ -33,6 +33,7 @@
 struct CRTP
 {
 public:
+    /** Exact type */
     using ExactType = T;
 
 protected:
diff --git a/arm_compute/core/utils/misc/Iterable.h b/arm_compute/core/utils/misc/Iterable.h
index 96a650a..d150111 100644
--- a/arm_compute/core/utils/misc/Iterable.h
+++ b/arm_compute/core/utils/misc/Iterable.h
@@ -49,21 +49,37 @@
     {
     }
 
+    /** Get beginning of iterator.
+     *
+     * @return beginning of iterator.
+     */
     typename T::reverse_iterator begin()
     {
         return _it.rbegin();
     }
 
+    /** Get end of iterator.
+     *
+     * @return end of iterator.
+     */
     typename T::reverse_iterator end()
     {
         return _it.rend();
     }
 
+    /** Get beginning of const iterator.
+     *
+     * @return beginning of const iterator.
+     */
     typename T::const_reverse_iterator cbegin()
     {
         return _it.rbegin();
     }
 
+    /** Get end of const iterator.
+     *
+     * @return end of const iterator.
+     */
     typename T::const_reverse_iterator cend()
     {
         return _it.rend();
diff --git a/arm_compute/core/utils/strong_type/StrongTypeAttributes.h b/arm_compute/core/utils/strong_type/StrongTypeAttributes.h
index b5ed48f..78a4032 100644
--- a/arm_compute/core/utils/strong_type/StrongTypeAttributes.h
+++ b/arm_compute/core/utils/strong_type/StrongTypeAttributes.h
@@ -34,6 +34,7 @@
 template <typename T>
 struct Comparable : misc::CRTP<T, Comparable>
 {
+#ifndef DOXYGEN_SKIP_THIS
     bool operator==(T const &other) const
     {
         return this->impl().get() == other.get();
@@ -58,6 +59,7 @@
     {
         return !(*this > other);
     }
+#endif /* DOXYGEN_SKIP_THIS */
 };
 } // namespace strong_type
 } // namespace arm_compute