Diff: smallest.h

Revision:

0:b47c2a7920c2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/smallest.h	Fri Mar 16 16:34:18 2018 +0000
@@ -0,0 +1,342 @@
+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2014 jwellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#if 0
+#error THIS HEADER IS A GENERATOR. DO NOT INCLUDE.
+#endif
+
+//***************************************************************************
+// This file has been auto generated. Do not edit this file.
+//***************************************************************************
+
+//***************************************************************************
+// To generate to header file, run this at the command line.
+// Note: You will need Python and COG installed.
+//
+// python -m cogapp -d -e -osmallest.h -DNTypes=<n> smallest_generator.h
+// Where <n> is the number of types to support.
+//
+// e.g.
+// To generate handlers for up to 16 types...
+// python -m cogapp -d -e -osmallest.h -DNTypes=16 smallest_generator.h
+//
+// See generate.bat
+//***************************************************************************
+
+#ifndef __ETL_SMALLEST__
+#define __ETL_SMALLEST__
+
+#include <stdint.h>
+
+#include "platform.h"
+#include "integral_limits.h"
+
+///\defgroup smallest smallest
+///\ingroup utilities
+
+namespace etl
+{
+  /* 7.18.2.1  Limits of exact-width integer types */
+    #define INT8_MIN (-128) 
+    #define INT16_MIN (-32768)
+    #define INT32_MIN (-2147483647 - 1)
+    #define INT64_MIN  (-9223372036854775807LL - 1)
+     
+    #define INT8_MAX 127
+    #define INT16_MAX 32767
+    #define INT32_MAX 2147483647
+    #define INT64_MAX 9223372036854775807LL
+ 
+    
+    #define UINT8_MAX 0xff /* 255U */
+    #define UINT16_MAX 0xffff /* 65535U */
+    #define UINT32_MAX 0xffffffff  /* 4294967295U */
+    #define UINT64_MAX 0xffffffffffffffffULL /* 18446744073709551615ULL */
+     
+    /* 7.18.2.2  Limits of minimum-width integer types */
+    #define INT_LEAST8_MIN INT8_MIN
+    #define INT_LEAST16_MIN INT16_MIN
+    #define INT_LEAST32_MIN INT32_MIN
+    #define INT_LEAST64_MIN INT64_MIN
+    
+    #define INT_LEAST8_MAX INT8_MAX
+    #define INT_LEAST16_MAX INT16_MAX
+    #define INT_LEAST32_MAX INT32_MAX
+    #define INT_LEAST64_MAX INT64_MAX
+     
+    #define UINT_LEAST8_MAX UINT8_MAX
+    #define UINT_LEAST16_MAX UINT16_MAX
+    #define UINT_LEAST32_MAX UINT32_MAX
+    #define UINT_LEAST64_MAX UINT64_MAX
+  
+  
+  //***************************************************************************
+  /// Template to determine the smallest type and size.
+  /// Supports up to 16 types.
+  /// Defines 'value_type' which is the type of the smallest parameter.
+  /// Defines 'size' which is the size of the smallest parameter.
+  ///\ingroup smallest
+  //***************************************************************************
+  template <typename T1, typename T2 = void, typename T3 = void, typename T4 = void, 
+            typename T5 = void, typename T6 = void, typename T7 = void, typename T8 = void, 
+            typename T9 = void, typename T10 = void, typename T11 = void, typename T12 = void, 
+            typename T13 = void, typename T14 = void, typename T15 = void, typename T16 = void>
+  struct smallest_type
+  {
+  private:
+
+    // Declaration.
+    template <const bool Boolean, typename TrueType, typename FalseType>
+    struct choose_type;
+
+    // Specialisation for 'true'.
+    // Defines 'type' as 'TrueType'.
+    template <typename TrueType, typename FalseType>
+    struct choose_type<true, TrueType, FalseType>
+    {
+      typedef TrueType type;
+    };
+
+    // Specialisation for 'false'. 
+    // Defines 'type' as 'FalseType'.
+    template <typename TrueType, typename FalseType>
+    struct choose_type<false, TrueType, FalseType>
+    {
+      typedef FalseType type;
+    };
+
+  public:
+
+    // Define 'smallest_other' as 'smallest_type' with all but the first parameter. 
+    typedef typename smallest_type<T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>::type smallest_other;
+
+    // Set 'type' to be the smallest of the first parameter and any of the others.
+    // This is recursive.
+    typedef typename choose_type<(sizeof(T1) < sizeof(smallest_other)), // Boolean
+                                  T1,                                   // TrueType
+                                  smallest_other>                       // FalseType
+                                  ::type type;                          // The smallest type of the two.
+
+    // The size of the smallest type.
+    enum
+    {
+      size = sizeof(type)
+    };
+  };
+
+  //***************************************************************************
+  // Specialisation for one template parameter.
+  //***************************************************************************
+  template <typename T1>
+  struct smallest_type<T1,   void, void, void, void, void, void, void, 
+                       void, void, void, void, void, void, void, void>
+  {
+    typedef T1 type;
+
+    enum
+    {
+      size = sizeof(type)
+    };
+  };
+  
+  namespace __private_smallest__
+  {
+    //*************************************************************************
+    // Determine the type to hold the number of bits based on the index.
+    //*************************************************************************
+    template <const int index>
+    struct best_fit_uint_type;
+    
+    //*************************************************************************
+    // Less than or equal to 8 bits.
+    //*************************************************************************
+    template <>
+    struct best_fit_uint_type<0>
+    {
+      typedef uint_least8_t type;
+    };
+
+    //*************************************************************************
+    // 9 to 16 bits.
+    //*************************************************************************
+    template <>
+    struct best_fit_uint_type<1>
+    {
+      typedef uint_least16_t type;
+    };
+
+    //*************************************************************************
+    // 17 to 31 bits.
+    //*************************************************************************
+    template <>
+    struct best_fit_uint_type<2>
+    {
+      typedef uint_least32_t type;
+    };
+
+    //*************************************************************************
+    // Greater than 32 bits.
+    //*************************************************************************
+    template <>
+    struct best_fit_uint_type<3>
+    {
+      typedef uint_least64_t type;
+    };
+
+    //*************************************************************************
+    // Determine the type to hold the number of bits based on the index.
+    //*************************************************************************
+    template <const int index>
+    struct best_fit_int_type;
+
+    //*************************************************************************
+    // Less than or equal to 8 bits.
+    //*************************************************************************
+    template <>
+    struct best_fit_int_type<0>
+    {
+      typedef int_least8_t type;
+    };
+
+    //*************************************************************************
+    // 9 to 16 bits.
+    //*************************************************************************
+    template <>
+    struct best_fit_int_type<1>
+    {
+      typedef int_least16_t type;
+    };
+
+    //*************************************************************************
+    // 17 to 31 bits.
+    //*************************************************************************
+    template <>
+    struct best_fit_int_type<2>
+    {
+      typedef int_least32_t type;
+    };
+
+    //*************************************************************************
+    // Greater than 32 bits.
+    //*************************************************************************
+    template <>
+    struct best_fit_int_type<3>
+    {
+      typedef int_least64_t type;
+    };
+  }
+
+  //***************************************************************************
+  /// Template to determine the smallest unsigned int type that can contain a 
+  /// value with the specified number of bits.
+  /// Defines 'type' which is the type of the smallest unsigned integer.
+  ///\ingroup smallest
+  //***************************************************************************
+  template <const size_t NBITS>
+  struct smallest_uint_for_bits
+  {
+  private:
+    
+    // Determines the index of the best unsigned type for the required number of bits.
+    static const int TYPE_INDEX = ((NBITS >  8) ? 1 : 0) + 
+                                  ((NBITS > 16) ? 1 : 0) +
+                                  ((NBITS > 32) ? 1 : 0);
+
+  public:
+
+    typedef typename __private_smallest__::best_fit_uint_type<TYPE_INDEX>::type type;
+  };
+
+  //***************************************************************************
+  /// Template to determine the smallest signed int type that can contain a 
+  /// value with the specified number of bits.
+  /// Defines 'type' which is the type of the smallest signed integer.
+  ///\ingroup smallest
+  //***************************************************************************
+  template <const size_t NBITS>
+  struct smallest_int_for_bits
+  {
+  private:
+
+    // Determines the index of the best unsigned type for the required number of bits.
+    static const int TYPE_INDEX = ((NBITS >  8) ? 1 : 0) +
+                                  ((NBITS > 16) ? 1 : 0) +
+                                  ((NBITS > 32) ? 1 : 0);
+
+  public:
+
+    typedef typename __private_smallest__::best_fit_int_type<TYPE_INDEX>::type type;
+  };
+
+  //***************************************************************************
+  /// Template to determine the smallest unsigned int type that can contain the
+  /// specified unsigned value.
+  /// Defines 'type' which is the type of the smallest unsigned integer.
+  ///\ingroup smallest
+  //***************************************************************************
+  template <const uintmax_t VALUE>
+  struct smallest_uint_for_value
+  {
+  private:
+
+    // Determines the index of the best unsigned type for the required value.
+    static const int TYPE_INDEX = ((VALUE > UINT_LEAST8_MAX)  ? 1 : 0) +
+                                  ((VALUE > UINT16_MAX) ? 1 : 0) + 
+                                  ((VALUE > UINT32_MAX) ? 1 : 0);
+
+  public:
+
+    typedef typename __private_smallest__::best_fit_uint_type<TYPE_INDEX>::type type;
+  };
+
+  //***************************************************************************
+  /// Template to determine the smallest int type that can contain the
+  /// specified signed value.
+  /// Defines 'type' which is the type of the smallest signed integer.
+  ///\ingroup smallest
+  //***************************************************************************
+  template <const intmax_t VALUE>
+  struct smallest_int_for_value
+  {
+  private:
+
+    // Determines the index of the best signed type for the required value.
+    static const int TYPE_INDEX = (((VALUE > INT_LEAST8_MAX)  || (VALUE < INT_LEAST8_MIN))  ? 1 : 0) + 
+                                  (((VALUE > INT16_MAX) || (VALUE < INT16_MIN)) ? 1 : 0) +
+                                  (((VALUE > INT32_MAX) || (VALUE < INT32_MIN)) ? 1 : 0);
+
+  public:
+
+    typedef typename __private_smallest__::best_fit_int_type<TYPE_INDEX>::type type;
+  };
+}
+
+#endif
+