blob: 5b69ed944b69eded144544fff857c1e0adb2336d (
plain)
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
|
// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef LEGACY_COMPILER_H_839567308565656789
#define LEGACY_COMPILER_H_839567308565656789
namespace std
{
//https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html
//https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations
//requires C++20! until then, this should suffice...
template <class T>
class span
{
public:
template <class Iterator>
span(Iterator first, Iterator last) : size_(last - first), data_(first != last ? &*first : nullptr) {}
template <class Container>
span(Container& cont) : span(cont.begin(), cont.end()) {}
using iterator = T*;
using const_iterator = const T*;
iterator begin() { return data_; }
iterator end () { return data_ + size_; }
const_iterator begin() const { return data_; }
const_iterator end () const { return data_ + size_; }
const_iterator cbegin() const { return begin(); }
const_iterator cend () const { return end (); }
T* data() const { return data_; }
size_t size() const { return size_; }
bool empty() const { return size_ == 0; }
private:
const size_t size_;
T* const data_;
};
}
#endif //LEGACY_COMPILER_H_839567308565656789
|
