/usr/include/dlib/any/any_abstract.h is in libdlib-dev 18.18-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | // Copyright (C) 2010 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#undef DLIB_AnY_ABSTRACT_H_
#ifdef DLIB_AnY_ABSTRACT_H_
#include <typeinfo>
namespace dlib
{
// ----------------------------------------------------------------------------------------
class bad_any_cast : public std::bad_cast
{
/*!
WHAT THIS OBJECT REPRESENTS
This object is the exception class used by the any object.
It is used to indicate when someone attempts to cast an any
object into a type which isn't contained in the any object.
!*/
public:
virtual const char* what() const throw() { return "bad_any_cast"; }
};
// ----------------------------------------------------------------------------------------
class any
{
/*!
INITIAL VALUE
- is_empty() == true
- for all T: contains<T>() == false
WHAT THIS OBJECT REPRESENTS
This object is basically a type-safe version of a void*. In particular,
it is a container which can contain only one object but the object may
be of any type.
It is somewhat like the type_safe_union except you don't have to declare
the set of possible content types beforehand. So in some sense this is
like a less type-strict version of the type_safe_union.
!*/
public:
any(
);
/*!
ensures
- this object is properly initialized
!*/
any (
const any& item
);
/*!
ensures
- copies the state of item into *this.
- Note that *this and item will contain independent copies of the
contents of item. That is, this function performs a deep
copy and therefore does not result in *this containing
any kind of reference to item.
!*/
template < typename T >
any (
const T& item
);
/*!
ensures
- #contains<T>() == true
- #cast_to<T>() == item
(i.e. a copy of item will be stored in *this)
!*/
void clear (
);
/*!
ensures
- #*this will have its default value. I.e. #is_empty() == true
!*/
template <typename T>
bool contains (
) const;
/*!
ensures
- if (this object currently contains an object of type T) then
- returns true
- else
- returns false
!*/
bool is_empty(
) const;
/*!
ensures
- if (this object contains any kind of object) then
- returns false
- else
- returns true
!*/
template <typename T>
T& cast_to(
);
/*!
ensures
- if (contains<T>() == true) then
- returns a non-const reference to the object contained within *this
- else
- throws bad_any_cast
!*/
template <typename T>
const T& cast_to(
) const;
/*!
ensures
- if (contains<T>() == true) then
- returns a const reference to the object contained within *this
- else
- throws bad_any_cast
!*/
template <typename T>
T& get(
);
/*!
ensures
- #is_empty() == false
- #contains<T>() == true
- if (contains<T>() == true)
- returns a non-const reference to the object contained in *this.
- else
- Constructs an object of type T inside *this
- Any previous object stored in this any object is destructed and its
state is lost.
- returns a non-const reference to the newly created T object.
!*/
any& operator= (
const any& item
);
/*!
ensures
- copies the state of item into *this.
- Note that *this and item will contain independent copies of the
contents of item. That is, this function performs a deep
copy and therefore does not result in *this containing
any kind of reference to item.
!*/
void swap (
any& item
);
/*!
ensures
- swaps *this and item
- does not invalidate pointers or references to the object contained
inside *this or item. Moreover, a pointer or reference to the object in
*this will now refer to the contents of #item and vice versa.
!*/
};
// ----------------------------------------------------------------------------------------
inline void swap (
any& a,
any& b
) { a.swap(b); }
/*!
provides a global swap function
!*/
// ----------------------------------------------------------------------------------------
template <
typename T
>
T& any_cast(
any& a
) { return a.cast_to<T>(); }
/*!
ensures
- returns a.cast_to<T>()
!*/
// ----------------------------------------------------------------------------------------
template <
typename T
>
const T& any_cast(
const any& a
) { return a.cast_to<T>(); }
/*!
ensures
- returns a.cast_to<T>()
!*/
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_AnY_ABSTRACT_H_
|