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* Re: libstdc++/9444: g++ STL requires iterators passed to string constructor to have a constructor without parameters, but C++ standard does not require that
@ 2003-01-30 9:44 paolo
0 siblings, 0 replies; 3+ messages in thread
From: paolo @ 2003-01-30 9:44 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, paolo, scmvs, val
Synopsis: g++ STL requires iterators passed to string constructor to have a constructor without parameters, but C++ standard does not require that
State-Changed-From-To: feedback->closed
State-Changed-By: paolo
State-Changed-When: Thu Jan 30 09:44:55 2003
State-Changed-Why:
Ok, by now the issue seems completely clear to me.
By the way, in case you really don't want to provide a
parameterless constructor just inherit from
std::iterator<std::input_iterator_tag, ...>
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9444
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: libstdc++/9444: g++ STL requires iterators passed to string constructor to have a constructor without parameters, but C++ standard does not require that
@ 2003-01-26 23:31 paolo
0 siblings, 0 replies; 3+ messages in thread
From: paolo @ 2003-01-26 23:31 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, nobody, paolo, scmvs, val
Synopsis: g++ STL requires iterators passed to string constructor to have a constructor without parameters, but C++ standard does not require that
Responsible-Changed-From-To: unassigned->paolo
Responsible-Changed-By: paolo
Responsible-Changed-When: Sun Jan 26 23:31:18 2003
Responsible-Changed-Why:
Analyzed.
State-Changed-From-To: open->feedback
State-Changed-By: paolo
State-Changed-When: Sun Jan 26 23:31:18 2003
State-Changed-Why:
In a nutshell, I do not agree. Indeed, the lines which you
emphasize are from:
_S_construct(..., forward_iterator_tag)
^^^^^^^^^^^^^^^^^^^^
Among the ISO C++ requirements for _forward_ iterators
(24.1.3, Table 74) is the parameterless constructor.
Paolo.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9444
^ permalink raw reply [flat|nested] 3+ messages in thread
* libstdc++/9444: g++ STL requires iterators passed to string constructor to have a constructor without parameters, but C++ standard does not require that
@ 2003-01-26 22:56 val
0 siblings, 0 replies; 3+ messages in thread
From: val @ 2003-01-26 22:56 UTC (permalink / raw)
To: gcc-gnats; +Cc: scmvs
>Number: 9444
>Category: libstdc++
>Synopsis: g++ STL requires iterators passed to string constructor to have a constructor without parameters, but C++ standard does not require that
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: rejects-legal
>Submitter-Id: net
>Arrival-Date: Sun Jan 26 22:56:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Val Samko
>Release: gcc version 3.2 (mingw special 20020817-1)
>Organization:
>Environment:
Win2K
>Description:
The following 100% ANSI C++ compliant code does not compile with g++, unless we add "it(){}" to "it" struct.
That is because of the following lines in include\c++\3.2\bits\basic_string.tcc
-------------------
// NB: Not required, but considered best practice.
if (__builtin_expect(__beg == _InIter(), 0))
__throw_logic_error("attempt to create string with null pointer");
-------------------
note that `_InIter()` there, which requires iterator to have
a parameterless constructor.
===========================
#include <string>
#include <vector>
using namespace std;
struct it : public std::iterator<std::forward_iterator_tag, string::value_type>
{
it(string::iterator i_) : i(i_) {}
char& operator *() { return *i; }
bool operator == (const it& i_) { return i == i_.i; }
bool operator != (const it& i_) { return i != i_.i; }
it& operator ++ () { ++i; return *this; }
string::iterator i;
};
template<class Cont, class It>
void foo(Cont& c, It f, It l) { typedef typename Cont::value_type vt; c.push_back(vt(f, l)); }
int main()
{
string s1 = "querty";
vector<string> s2;
foo(s2, it(s1.begin()), it(s1.end()));
return 1;
}
>How-To-Repeat:
>Fix:
Remove offending lines from
include\c++\3.2\bits\basic_string.tcc
>Release-Note:
>Audit-Trail:
>Unformatted:
^ permalink raw reply [flat|nested] 3+ messages in thread
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2003-01-30 9:44 libstdc++/9444: g++ STL requires iterators passed to string constructor to have a constructor without parameters, but C++ standard does not require that paolo
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2003-01-26 23:31 paolo
2003-01-26 22:56 val
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