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       1                 :            : // *****************************************************************************
       2                 :            : /*!
       3                 :            :   \file      src/RNGTest/Battery.hpp
       4                 :            :   \copyright 2012-2015 J. Bakosi,
       5                 :            :              2016-2018 Los Alamos National Security, LLC.,
       6                 :            :              2019-2021 Triad National Security, LLC.
       7                 :            :              All rights reserved. See the LICENSE file for details.
       8                 :            :   \brief     Random number generator test harness
       9                 :            :   \details   This file defines a generic random number generator test harness
      10                 :            :     class. The class uses runtime polymorphism without client-side inheritance:
      11                 :            :     inheritance is confined to the internals of the class, invisible to
      12                 :            :     client-code. The class exclusively deals with ownership enabling client-side
      13                 :            :     value semantics. Credit goes to Sean Parent at Adobe:
      14                 :            :     https://github.com/sean-parent/
      15                 :            :     sean-parent.github.com/wiki/Papers-and-Presentations.
      16                 :            : */
      17                 :            : // *****************************************************************************
      18                 :            : #ifndef Battery_h
      19                 :            : #define Battery_h
      20                 :            : 
      21                 :            : #include <functional>
      22                 :            : #include <memory>
      23                 :            : 
      24                 :            : #include "NoWarning/charm++.hpp"
      25                 :            : 
      26                 :            : #include "Macro.hpp"
      27                 :            : #include "Has.hpp"
      28                 :            : 
      29                 :            : namespace rngtest {
      30                 :            : 
      31                 :            : //! \brief Battery
      32                 :            : //! \details This class uses runtime polymorphism without client-side
      33                 :            : //!   inheritance: inheritance is confined to the internals of the this class,
      34                 :            : //!   invisible to client-code. The class exclusively deals with ownership
      35                 :            : //!   enabling client-side value semantics. Credit goes to Sean Parent at Adobe:
      36                 :            : //!   https://github.com/sean-parent/sean-parent.github.com/wiki/
      37                 :            : //!   Papers-and-Presentations. For example client code that models a Battery,
      38                 :            : //!   see rngtest::TestU01Suite.
      39                 :            : class Battery {
      40                 :            : 
      41                 :            :   public:
      42                 :            :     //! \brief Constructor taking a function pointer to a constructor of an
      43                 :            :     //!    object modeling Concept
      44                 :            :     //! \details Passing std::function allows late execution of the constructor
      45                 :            :     //!   of T, i.e., at some future time, and thus usage from a factory. Note
      46                 :            :     //!   that the value of the first function argument, std::function<T()>, is
      47                 :            :     //!   not used here, but its constructor type, T, is used to enable the
      48                 :            :     //!   compiler to deduce the model constructor type, used to create its
      49                 :            :     //!   Charm proxy, defined by T::Proxy. The actual constructor of T is not
      50                 :            :     //!   called here but at some future time by the Charm++ runtime system,
      51                 :            :     //!   here only an asynchrounous ckNew() is called, i.e., a message (or
      52                 :            :     //!   request) for a future call to T's constructor. This overload is only
      53                 :            :     //!   enabled for Charm++ chare objects defining typedef 'Proxy', which must
      54                 :            :     //!   define the Charm++ proxy. All optional constructor arguments are
      55                 :            :     //!   forwarded to ckNew() and thus to T's constructor. If it was somehow
      56                 :            :     //!   possible to obtain all bound arguments' types and values from an
      57                 :            :     //!   already-bound std::function, we could use those instead of having to
      58                 :            :     //!   explicitly forward the model constructor arguments via this host
      59                 :            :     //!   constructor.
      60                 :            :     //! \param[in] c Function pointer to a constructor of an object modeling
      61                 :            :     //!    Concept.
      62                 :            :     //! \param[in] args Constructor arguments
      63                 :            :     //! \see See also tk::recordCharmModel().
      64                 :            :     template< typename T, typename... CtrArgs >
      65                 :          4 :     explicit Battery( std::function<T()> c [[maybe_unused]], CtrArgs... args ) :
      66                 :            :       self( std::make_unique< Model< typename T::Proxy > >
      67                 :          4 :             (std::move(T::Proxy::ckNew(std::forward<CtrArgs>(args)...))) ) {
      68                 :            :       Assert( c == nullptr, "std::function argument to Battery Charm++ "
      69                 :            :                             "constructor must be nullptr" );
      70                 :          4 :     }
      71                 :            : 
      72                 :            :     //! Public interface to evaluating a statistical test
      73                 :            :     void evaluate( std::vector< std::vector< std::string > > status ) const
      74                 :            :     { self->evaluate( status ); }
      75                 :            : 
      76                 :            :     //! Public interface to collecting the number of statistics from a test
      77                 :            :     void npval( std::size_t n ) const { self->npval( n ); }
      78                 :            : 
      79                 :            :     //! Public interface to collecting test name(s) from a test
      80                 :            :     void names( std::vector< std::string > n ) const { self->names( n ); }
      81                 :            : 
      82                 :            :     //! Copy assignment
      83                 :            :     Battery& operator=( const Battery& x )
      84                 :            :     { Battery tmp(x); *this = std::move(tmp); return *this; }
      85                 :            :     //! Copy constructor
      86                 :            :     Battery( const Battery& x ) : self( x.self->copy() ) {}
      87                 :            :     //! Move assignment
      88                 :            :     Battery& operator=( Battery&& ) noexcept = default;
      89                 :            :     //! Move constructor
      90                 :            :     Battery( Battery&& ) noexcept = default;
      91                 :            : 
      92                 :            :   private:
      93                 :            :     //! Concept is a pure virtual base class specifying the requirements of
      94                 :            :     //! polymorphic objects deriving from it
      95                 :            :     struct Concept {
      96                 :            :       Concept() = default;
      97                 :          0 :       Concept( const Concept& ) = default;
      98                 :            :       virtual ~Concept() = default;
      99                 :            :       virtual Concept* copy() const = 0;
     100                 :            :       virtual void evaluate( std::vector< std::vector< std::string > >
     101                 :            :                                status ) = 0;
     102                 :            :       virtual void npval( std::size_t n ) = 0;
     103                 :            :       virtual void names( std::vector< std::string > n ) = 0;
     104                 :            :     };
     105                 :            : 
     106                 :            :     //! Model models the Concept above by deriving from it and overriding the
     107                 :            :     //! the virtual functions required by Concept
     108                 :            :     template< typename T >
     109         [ -  - ]:          0 :     struct Model : Concept {
     110         [ +  - ]:          4 :       Model( T x ) : data( std::move(x) ) {}
     111                 :          0 :       Concept* copy() const override { return new Model( *this ); }
     112                 :          0 :       void evaluate( std::vector< std::vector< std::string > > status )
     113                 :          0 :         override { data.evaluate( status ); }
     114                 :          0 :       void npval( std::size_t n ) override { data.npval( n ); }
     115                 :          0 :       void names( std::vector< std::string > n ) override { data.names( n ); }
     116                 :            :       T data;
     117                 :            :     };
     118                 :            : 
     119                 :            :     std::unique_ptr< Concept > self;    //!< Base pointer used polymorphically
     120                 :            : };
     121                 :            : 
     122                 :            : } // rngtest::
     123                 :            : 
     124                 :            : #endif // Battery_h