/usr/include/libelfin/dwarf/small_vector.hh is in libelfin-dev 0.3-1.
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 | // Copyright (c) 2013 Austin T. Clements. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
#ifndef _DWARFPP_SMALL_VECTOR_HH_
#define _DWARFPP_SMALL_VECTOR_HH_
DWARFPP_BEGIN_NAMESPACE
/**
* A vector-like class that only heap allocates above a specified
* size.
*/
template<class T, unsigned Min>
class small_vector
{
public:
typedef T value_type;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef size_t size_type;
small_vector()
: base((T*)buf), end(base), cap((T*)&buf[sizeof(T[Min])])
{
}
small_vector(const small_vector<T, Min> &o)
: base((T*)buf), end(base), cap((T*)&buf[sizeof(T[Min])])
{
*this = o;
}
small_vector(small_vector<T, Min> &&o)
: base((T*)buf), end(base), cap((T*)&buf[sizeof(T[Min])])
{
if ((char*)o.base == o.buf) {
// Elements are inline; have to copy them
base = (T*)buf;
end = base;
cap = (T*)&buf[sizeof(T[Min])];
*this = o;
o.clear();
} else {
// Elements are external; swap pointers
base = o.base;
end = o.end;
cap = o.cap;
o.base = (T*)o.buf;
o.end = o.base;
o.cap = (T*)&o.buf[sizeof(T[Min])];
}
}
~small_vector()
{
clear();
if ((char*)base != buf)
delete[] (char*)base;
}
small_vector &operator=(const small_vector<T, Min> &o)
{
size_type osize = o.size();
clear();
reserve(osize);
for (size_type i = 0; i < osize; i++)
new (&base[i]) T(o[i]);
end = base + osize;
return *this;
}
size_type size() const
{
return end - base;
}
bool empty() const
{
return base == end;
}
void reserve(size_type n)
{
if (n <= (size_type)(cap - base))
return;
size_type target = cap - base;
if (target == 0)
target = 1;
while (target < n)
target <<= 1;
char *newbuf = new char[sizeof(T[target])];
T *src = base, *dest = (T*)newbuf;
for (; src < end; src++, dest++) {
new(dest) T(*src);
dest->~T();
}
if ((char*)base != buf)
delete[] (char*)base;
base = (T*)newbuf;
end = dest;
cap = base + target;
}
reference operator[](size_type n)
{
return base[n];
}
const_reference operator[](size_type n) const
{
return base[n];
}
reference at(size_type n)
{
return base[n];
}
const_reference at(size_type n) const
{
return base[n];
}
/**
* "Reverse at". revat(0) is equivalent to back(). revat(1)
* is the element before back. Etc.
*/
reference revat(size_type n)
{
return *(end - 1 - n);
}
const_reference revat(size_type n) const
{
return *(end - 1 - n);
}
reference front()
{
return base[0];
}
const_reference front() const
{
return base[0];
}
reference back()
{
return *(end-1);
}
const_reference back() const
{
return *(end-1);
}
void push_back(const T& x)
{
reserve(size() + 1);
new (end) T(x);
end++;
}
void push_back(T&& x)
{
reserve(size() + 1);
new (end) T(std::move(x));
end++;
}
void pop_back()
{
end--;
end->~T();
}
void clear()
{
for (T* p = base; p < end; ++p)
p->~T();
end = base;
}
private:
char buf[sizeof(T[Min])];
T *base, *end, *cap;
};
DWARFPP_END_NAMESPACE
#endif
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