New time_utils function: the_beginning_of_time (#50)

Signed-off-by: Juan López Fernández <juanlopez@eprosima.com>

Author: juanlofer-eprosima

cpp_utils/include/cpp_utils/time/time_utils.hpp

@@ -42,7 +42,10 @@ using Timestamp = std::chrono::time_point<std::chrono::system_clock>;
 CPP_UTILS_DllAPI Timestamp now() noexcept;
 
 //! Returns the maximum time available for \c Timestamp
-CPP_UTILS_DllAPI Timestamp the_end_of_times() noexcept;
+CPP_UTILS_DllAPI Timestamp the_end_of_time() noexcept;
+
+//! Returns the minimum time available for \c Timestamp
+CPP_UTILS_DllAPI Timestamp the_beginning_of_time() noexcept;
 
 CPP_UTILS_DllAPI Timestamp date_to_timestamp(
         unsigned int year,

cpp_utils/include/cpp_utils/wait/impl/WaitHandler.ipp

@@ -147,7 +147,7 @@ std::unique_lock<std::mutex> WaitHandler<T>::blocking_wait_(
     }
     else
     {
-        time_to_wait_until = utils::the_end_of_times();
+        time_to_wait_until = utils::the_end_of_time();
     }
 
     bool finished_for_condition_met = wait_condition_variable_.wait_until(

cpp_utils/src/cpp/time/time_utils.cpp

@@ -38,11 +38,16 @@ Timestamp now() noexcept
     return std::chrono::system_clock::now();
 }
 
-Timestamp the_end_of_times() noexcept
+Timestamp the_end_of_time() noexcept
 {
     return std::chrono::time_point<std::chrono::system_clock>::max();
 }
 
+Timestamp the_beginning_of_time() noexcept
+{
+    return std::chrono::time_point<std::chrono::system_clock>::min();
+}
+
 Timestamp date_to_timestamp(
         unsigned int year,
         unsigned int month,