add templated int and real distribution to rngmgr; add func to return amount of random values; support untyped value deduction; use typed min/max ranges for unspecified type;

src/world/Manager/DebugCommandMgr.cpp

@@ -45,6 +45,7 @@
 #include "WorldServer.h"
 
 #include "Session.h"
+#include <Manager/RNGMgr.h>
 
 using namespace Sapphire::Network;
 using namespace Sapphire::Network::Packets;
@@ -177,6 +178,15 @@ void DebugCommandMgr::set( char* data, Entity::Player& player, std::shared_ptr<
 
   if( ( ( subCommand == "pos" ) || ( subCommand == "posr" ) ) && ( params != "" ) )
   {
+    auto& rngMgr = Common::Service< RNGMgr >::ref();
+    auto state = rngMgr.getRandGenerator( 0, 10 );
+    auto arr = state.nextCount< 10 >();
+
+    for( auto val : arr )
+    {
+      Logger::info( std::to_string( val ) );
+    }
+
     int32_t posX;
     int32_t posY;
     int32_t posZ;

src/world/Manager/RNGMgr.h

@@ -8,6 +8,7 @@
 #include <random>
 #include <memory>
 #include <type_traits>
+#include <vector>
 
 namespace Sapphire::World::Manager
 {
@@ -19,24 +20,47 @@ namespace Sapphire::World::Manager
   {
   public:
     RandGenerator( std::shared_ptr< std::mt19937 > pEngine, T minRange = std::numeric_limits< T >::min(), T maxRange = std::numeric_limits< T >::max() )
-      : m_engine( pEngine ), m_dist( minRange, maxRange )
+      : m_engine( pEngine ), m_fpuDist( minRange, maxRange ), m_intDist( minRange, maxRange )
     {
 
     }
 
+    // returns a single value for T type on set ranges, deducing real or integer distribution from given numeric type
     T next()
     {
-      return m_dist( *m_engine );
+      if constexpr( std::is_integral< T >::value )
+        return m_intDist( *m_engine );
+
+      return m_fpuDist( *m_engine );
     }
 
-  private:
+    // returns an array of size nSize with values type T on set ranges, deducing real or integer distribution from given numeric type
-    std::uniform_real_distribution< T > m_dist;
+    template< std::size_t nSize >
+    const std::array< T, nSize > nextCount()
+    {
+      std::array< T, nSize > _valPush;
+
+      for( auto i = 0; i < nSize; ++i )
+      {
+        if constexpr( std::is_integral< T >::value )
+          _valPush[ i ] = ( m_intDist( *m_engine ) );
+        else
+          _valPush[ i ] = ( m_fpuDist( *m_engine ) );
+      }
+
+      return _valPush;
+    }
+
+  protected:
+    std::uniform_real_distribution<> m_fpuDist;
+    std::uniform_int_distribution<> m_intDist;
     std::shared_ptr< std::mt19937 > m_engine;
   };
 
   class RNGMgr
   {
   public:
+    // Constructs a manager to supply states for random integer and float distribution using a Mersenne Twister engine
     RNGMgr()
     {
       m_engine = std::make_shared< std::mt19937 >( *engineSeed< std::mt19937::state_size >() );
@@ -48,7 +72,7 @@ namespace Sapphire::World::Manager
     RNGMgr& operator=( const RNGMgr& pRNGMgr ) = delete;
 
     /*!
-     * @brief Creates a RNG with specified parameters for multiple uses
+     * @brief Creates a state with specified parameters for multiple uses
      * @tparam Numeric type to be used for the generator
      * @param Minimum value possible for the random value
      * @param Maximum value possible for the random value
@@ -60,6 +84,17 @@ namespace Sapphire::World::Manager
       return RandGenerator< T >( m_engine, minRange, maxRange );
     }
 
+    /*!
+     * @brief Creates a state with only typed data arithmetic range
+     * @tparam Numeric type to be used for the generator and range (::min(), ::max() of numeric type)
+     * @return Random number generator object
+     */
+    template< typename T, typename = typename std::enable_if< std::is_arithmetic< T >::value, T >::type >
+    RandGenerator< T > getRandGenerator()
+    {
+      return RandGenerator< T >( m_engine );
+    }
+
   private:
 
     template< std::size_t STATE_SIZE >
@@ -70,6 +105,11 @@ namespace Sapphire::World::Manager
       std::array< uint32_t, STATE_SIZE > seedArray;
       std::random_device rd;
 
+      // check if kernel can supply sufficiently non-deterministic output
+
+      if( rd.entropy() == 0.f )
+        Logger::error( "Kernel random device entropy reported zero - Random number generator may be poor quality" );
+
       std::generate_n( seedArray.data(), seedArray.size(), std::ref( rd ) );
       auto pSeq = std::make_unique< std::seed_seq >( std::begin( seedArray ), std::end( seedArray ) );
 

src/world/WorldServer.cpp

@@ -163,6 +163,9 @@ void WorldServer::run( int32_t argc, char* argv[] )
   }
   Common::Service< Db::DbWorkerPool< Db::ZoneDbConnection > >::set( pDb );
 
+  auto pRNGMgr = std::make_shared< Manager::RNGMgr >();
+  Common::Service< Manager::RNGMgr >::set( pRNGMgr );
+
   Logger::info( "Loading all players" );
   if( !loadPlayers() )
   {
@@ -193,9 +196,6 @@ void WorldServer::run( int32_t argc, char* argv[] )
   auto pNaviMgr = std::make_shared< Manager::NaviMgr >();
   Common::Service< Manager::NaviMgr >::set( pNaviMgr );
 
-  auto pRNGMgr = std::make_shared< Manager::RNGMgr >();
-  Common::Service< Manager::RNGMgr >::set( pRNGMgr );
-
   Logger::info( "TerritoryMgr: Setting up zones" );
   auto pTeriMgr = std::make_shared< Manager::TerritoryMgr >();
   auto pHousingMgr = std::make_shared< Manager::HousingMgr >();