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
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <istream>
// template <class charT, class traits>
// basic_istream<charT,traits>&
// ws(basic_istream<charT,traits>& is);
#include <istream>
#include <cassert>
template <class CharT>
struct testbuf
: public std::basic_streambuf<CharT>
{
typedef std::basic_string<CharT> string_type;
typedef std::basic_streambuf<CharT> base;
private:
string_type str_;
public:
testbuf() {}
testbuf(const string_type& str)
: str_(str)
{
base::setg(const_cast<CharT*>(str_.data()),
const_cast<CharT*>(str_.data()),
const_cast<CharT*>(str_.data()) + str_.size());
}
CharT* eback() const {return base::eback();}
CharT* gptr() const {return base::gptr();}
CharT* egptr() const {return base::egptr();}
};
int main()
{
{
testbuf<char> sb(" 123");
std::istream is(&sb);
ws(is);
assert(is.good());
assert(is.peek() == '1');
}
{
testbuf<wchar_t> sb(L" 123");
std::wistream is(&sb);
ws(is);
assert(is.good());
assert(is.peek() == L'1');
}
{
testbuf<char> sb(" ");
std::istream is(&sb);
ws(is);
assert(!is.fail());
assert(is.eof());
ws(is);
assert(is.eof());
assert(is.fail());
}
{
testbuf<wchar_t> sb(L" ");
std::wistream is(&sb);
ws(is);
assert(!is.fail());
assert(is.eof());
ws(is);
assert(is.eof());
assert(is.fail());
}
}
|
