kc3-lang/harfbuzz/src/hb-meta.hh

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• Hash : ef33b5d1
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  Date : 2019-03-30T14:39:21
  

  [map] Deref pointers before equality check
  

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• src/hb-meta.hh

• /*
   * Copyright © 2018  Google, Inc.
   *
   *  This is part of HarfBuzz, a text shaping library.
   *
   * Permission is hereby granted, without written agreement and without
   * license or royalty fees, to use, copy, modify, and distribute this
   * software and its documentation for any purpose, provided that the
   * above copyright notice and the following two paragraphs appear in
   * all copies of this software.
   *
   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
   * DAMAGE.
   *
   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
   *
   * Google Author(s): Behdad Esfahbod
   */
  
  #ifndef HB_META_HH
  #define HB_META_HH
  
  #include "hb.hh"
  
  
  /*
   * C++ template meta-programming & fundamentals used with them.
   */
  
  
  template <typename T> static inline T*
  hb_addressof (const T& arg)
  {
  #pragma GCC diagnostic push
  #pragma GCC diagnostic ignored "-Wcast-align"
    /* https://en.cppreference.com/w/cpp/memory/addressof */
    return reinterpret_cast<T*>(
  	   &const_cast<char&>(
  	      reinterpret_cast<const volatile char&>(arg)));
  #pragma GCC diagnostic pop
  }
  
  template <typename T> static inline T hb_declval ();
  #define hb_declval(T) (hb_declval<T> ())
  
  template <typename T> struct hb_match_const { typedef T type; enum { value = false }; };
  template <typename T> struct hb_match_const<const T> { typedef T type; enum { value = true }; };
  #define hb_remove_const(T) typename hb_match_const<T>::type
  #define hb_is_const(T) hb_match_const<T>::value
  template <typename T> struct hb_match_reference { typedef T type; enum { value = false }; };
  template <typename T> struct hb_match_reference<T &> { typedef T type; enum { value = true }; };
  #define hb_remove_reference(T) typename hb_match_reference<T>::type
  #define hb_is_reference(T) hb_match_reference<T>::value
  template <typename T> struct hb_match_pointer { typedef T type; enum { value = false }; };
  template <typename T> struct hb_match_pointer<T *> { typedef T type; enum { value = true }; };
  #define hb_remove_pointer(T) typename hb_match_pointer<T>::type
  #define hb_is_pointer(T) hb_match_pointer<T>::value
  
  static const struct
  {
    template <typename T>
    T operator () (T v) const { return v; }
    template <typename T>
    T& operator () (T *v) const { return *v; }
  } hb_deref_pointer HB_UNUSED;
  
  
  /* Void!  For when we need a expression-type of void. */
  struct hb_void_t { typedef void value; };
  
  /* Bool!  For when we need to evaluate type-dependent expressions
   * in a template argument. */
  template <bool b> struct hb_bool_tt { enum { value = b }; };
  typedef hb_bool_tt<true> hb_true_t;
  typedef hb_bool_tt<false> hb_false_t;
  
  
  template<bool B, typename T = void>
  struct hb_enable_if {};
  
  template<typename T>
  struct hb_enable_if<true, T> { typedef T type; };
  
  #define hb_enable_if(Cond) typename hb_enable_if<(Cond)>::type* = nullptr
  
  
  /*
   * Meta-functions.
   */
  
  template <typename T> struct hb_is_signed;
  /* https://github.com/harfbuzz/harfbuzz/issues/1535 */
  template <> struct hb_is_signed<int8_t> { enum { value = true }; };
  template <> struct hb_is_signed<int16_t> { enum { value = true }; };
  template <> struct hb_is_signed<int32_t> { enum { value = true }; };
  template <> struct hb_is_signed<int64_t> { enum { value = true }; };
  template <> struct hb_is_signed<uint8_t> { enum { value = false }; };
  template <> struct hb_is_signed<uint16_t> { enum { value = false }; };
  template <> struct hb_is_signed<uint32_t> { enum { value = false }; };
  template <> struct hb_is_signed<uint64_t> { enum { value = false }; };
  #define hb_is_signed(T) hb_is_signed<T>::value
  
  template <bool is_signed> struct hb_signedness_int;
  template <> struct hb_signedness_int<false> { typedef unsigned int value; };
  template <> struct hb_signedness_int<true>  { typedef   signed int value; };
  #define hb_signedness_int(T) hb_signedness_int<T>::value
  
  template <typename T> struct hb_is_integer { enum { value = false }; };
  template <> struct hb_is_integer<char> { enum { value = true }; };
  template <> struct hb_is_integer<signed char> { enum { value = true }; };
  template <> struct hb_is_integer<unsigned char> { enum { value = true }; };
  template <> struct hb_is_integer<signed short> { enum { value = true }; };
  template <> struct hb_is_integer<unsigned short> { enum { value = true }; };
  template <> struct hb_is_integer<signed int> { enum { value = true }; };
  template <> struct hb_is_integer<unsigned int> { enum { value = true }; };
  template <> struct hb_is_integer<signed long> { enum { value = true }; };
  template <> struct hb_is_integer<unsigned long> { enum { value = true }; };
  template <> struct hb_is_integer<signed long long> { enum { value = true }; };
  template <> struct hb_is_integer<unsigned long long> { enum { value = true }; };
  #define hb_is_integer(T) hb_is_integer<T>::value
  
  
  #endif /* HB_META_HH */
  

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