(file and class names changed to protect the innocent)
g++ -Wall -c file.cpp: In member function `std::string
Some_Class::get _member(const std::string&) const':
file.cpp:46: passing `const std::map<std::s tring,
std::string, std::less<std:: string>, std::allocator< std::pair<const
std::string, std::string> > >' as `this' argument of `_Tp& std::map<_Key,
_Tp, _Compare, _Alloc>::operat or[](const _Key&) [with _Key = std::string,
_Tp = std::string, _Compare = std::less<std:: string>, _Alloc =
std::allocator< std::pair<const std::string, std::string> >]' discards
qualifiers
I can't make heads or tails of this error. I'm guessing it has something to
do with calling a non-const function on some const object. Any ideas?
The function SomeClass::get_ member is:
std::string SomeClass::get_ member(const std::string &name) const
{
return _member[name];
}
where _member is a std::map<std::s tring, std::string>.
Jul 22 '05
18  2381 
Joe Laughlin wrote:
These weird errors just keep on coming! Thanks everyone again for your
help.
Please don't tell me this error is because of const again... :-( But I'd
wager it is.
// 6-9 from Accelerated C++
// Use library algorithm to cat all elements of a vector<string>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
int main()
{
std::vector<std ::string> vec;
vec.push_back(" Hi!");
vec.push_back(" How ");
vec.push_back(" are ");
vec.push_back(" you ");
vec.push_back(" doing?");
std::string new_string;
copy(vec.begin( ), vec.end(), std::back_inser ter(new_string) );
std::cout << new_string << std::endl;
return 0;
}
g++ -Wall -pedantic -o 6-9 6-9.cpp
/usr/include/c++/3.2.2/bits/stl_algobase.h: In function `_OutputIter
std::__copy(_Ra ndomAccessIter, _RandomAccessIt er, _OutputIter,
std::random_acc ess_iterator_ta g) [with _RandomAccessIt er = std::string*,
_OutputIter = std::back_inser t_iterator<std: :string>]':
/usr/include/c++/3.2.2/bits/stl_algobase.h: 260: instantiated from
`_OutputIter std::__copy_aux 2(_InputIter, _InputIter, _
OutputIter, __false_type) [with _InputIter = std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 303: instantiated from
`_OutputIter std::__copy_ni2 (_InputIter, _InputIter, _O
utputIter, __false_type) [with _InputIter = std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 314: instantiated from
`_OutputIter std::__copy_ni1 (_InputIter, _InputIter, _O
utputIter, __true_type) [with _InputIter =
__gnu_cxx::__no rmal_iterator<s td::string*, std::vector<std ::string,
std::allocat
or<std::string> > >, _OutputIter = std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 349: instantiated from
`_OutputIter std::copy(_Inpu tIter, _InputIter, _OutputI
ter) [with _InputIter = __gnu_cxx::__no rmal_iterator<s td::string*,
std::vector<std ::string, std::allocator< std::string> > >
, _OutputIter = std::back_inser t_iterator<std: :string>]'
6-9.cpp:22: instantiated from here
/usr/include/c++/3.2.2/bits/stl_algobase.h: 241: no match for `
std::back_inser t_iterator<std: :string>& = std::basic_stri ng<char,
std::char_trait s<char>, std::allocator< char> >&' operator
/usr/include/c++/3.2.2/bits/stl_iterator.h: 355: candidates are:
std::back_inser t_iterator<_Con tainer>&
std::back_inser t_iterator<_Con tainer>::operat or=(_Container: :const_referenc e
)
[with _Container = std::string]
/usr/include/c++/3.2.2/bits/stl_iterator.h: 330:
std::back_inser t_iterator<std: :string>&
std::back_inser t_iterator<std: :string>::opera tor=(const
std::back_inser t_iterator<std: :string>&)
"Joe Laughlin" <Jo************ ***@boeing.com> wrote in message
news:I6******** @news.boeing.co m... Joe Laughlin wrote:
These weird errors just keep on coming! Thanks everyone again for your
help.
Please don't tell me this error is because of const again... :-( But I'd
wager it is.
Not this time. :-)
See below.
// 6-9 from Accelerated C++
// Use library algorithm to cat all elements of a vector<string>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
int main()
{
std::vector<std ::string> vec;
vec.push_back(" Hi!");
vec.push_back(" How ");
vec.push_back(" are ");
vec.push_back(" you ");
vec.push_back(" doing?");
std::string new_string;
copy(vec.begin( ), vec.end(), std::back_inser ter(new_string) );
std::cout << new_string << std::endl;
return 0;
}
g++ -Wall -pedantic -o 6-9 6-9.cpp
/usr/include/c++/3.2.2/bits/stl_algobase.h: In function `_OutputIter
std::__copy(_Ra ndomAccessIter, _RandomAccessIt er, _OutputIter,
std::random_acc ess_iterator_ta g) [with _RandomAccessIt er =
std::string*, _OutputIter = std::back_inser t_iterator<std: :string>]':
/usr/include/c++/3.2.2/bits/stl_algobase.h: 260: instantiated from
`_OutputIter std::__copy_aux 2(_InputIter, _InputIter, _
OutputIter, __false_type) [with _InputIter = std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 303: instantiated from
`_OutputIter std::__copy_ni2 (_InputIter, _InputIter, _O
utputIter, __false_type) [with _InputIter = std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 314: instantiated from
`_OutputIter std::__copy_ni1 (_InputIter, _InputIter, _O
utputIter, __true_type) [with _InputIter =
__gnu_cxx::__no rmal_iterator<s td::string*, std::vector<std ::string,
std::allocat
or<std::string> > >, _OutputIter =
std::back_inser t_iterator<std: :string>]' /usr/include/c++/3.2.2/bits/stl_algobase.h: 349: instantiated from
`_OutputIter std::copy(_Inpu tIter, _InputIter, _OutputI
ter) [with _InputIter = __gnu_cxx::__no rmal_iterator<s td::string*,
std::vector<std ::string, std::allocator< std::string> > >
, _OutputIter = std::back_inser t_iterator<std: :string>]'
6-9.cpp:22: instantiated from here
/usr/include/c++/3.2.2/bits/stl_algobase.h: 241: no match for `
std::back_inser t_iterator<std: :string>& = std::basic_stri ng<char,
std::char_trait s<char>, std::allocator< char> >&' operator
/usr/include/c++/3.2.2/bits/stl_iterator.h: 355: candidates are:
std::back_inser t_iterator<_Con tainer>&
std::back_inser t_iterator<_Con tainer>::operat or=(_Container: :const_referenc e )
[with _Container = std::string]
/usr/include/c++/3.2.2/bits/stl_iterator.h: 330:
std::back_inser t_iterator<std: :string>&
std::back_inser t_iterator<std: :string>::opera tor=(const
std::back_inser t_iterator<std: :string>&)
'back_insert_it erator' requires that the container type specified by
its template argument defines members 'push_back()' and 'value_type'.
'std::string' defines the latter, but not the former.
IOW you cannot use 'back_insert_it erator' with a 'std::string'.
('std::string', while sharing much commonality with them, isn't
strictly a 'container').
-Mike
Mike Wahler wrote: "Joe Laughlin" <Jo************ ***@boeing.com> wrote in
message news:I6******** @news.boeing.co m... Joe Laughlin wrote:
These weird errors just keep on coming! Thanks everyone
again for your help.
Please don't tell me this error is because of const
again... :-( But I'd wager it is.
Not this time. :-)
See below.
// 6-9 from Accelerated C++
// Use library algorithm to cat all elements of a
vector<string>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
int main()
{
std::vector<std ::string> vec;
vec.push_back(" Hi!");
vec.push_back(" How ");
vec.push_back(" are ");
vec.push_back(" you ");
vec.push_back(" doing?");
std::string new_string;
copy(vec.begin( ), vec.end(),
std::back_inser ter(new_string) );
std::cout << new_string << std::endl;
return 0;
}
g++ -Wall -pedantic -o 6-9 6-9.cpp
/usr/include/c++/3.2.2/bits/stl_algobase.h: In function
`_OutputIter std::__copy(_Ra ndomAccessIter,
_RandomAccessIt er, _OutputIter,
std::random_acc ess_iterator_ta g) [with
_RandomAccessIt er = std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]':
/usr/include/c++/3.2.2/bits/stl_algobase.h: 260:
instantiated from `_OutputIter
std::__copy_aux 2(_InputIter, _InputIter, _
OutputIter, __false_type) [with _InputIter =
std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 303:
instantiated from `_OutputIter
std::__copy_ni2 (_InputIter, _InputIter, _O
utputIter, __false_type) [with _InputIter =
std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 314:
instantiated from `_OutputIter
std::__copy_ni1 (_InputIter, _InputIter, _O
utputIter, __true_type) [with _InputIter =
__gnu_cxx::__no rmal_iterator<s td::string*,
std::vector<std ::string, std::allocat
or<std::string> > >, _OutputIter =
std::back_inser t_iterator<std: :string>]' /usr/include/c++/3.2.2/bits/stl_algobase.h: 349:
instantiated from `_OutputIter std::copy(_Inpu tIter,
_InputIter, _OutputI
ter) [with _InputIter =
__gnu_cxx::__no rmal_iterator<s td::string*,
std::vector<std ::string, std::allocator< std::string> > >
, _OutputIter = std::back_inser t_iterator<std: :string>]'
6-9.cpp:22: instantiated from here
/usr/include/c++/3.2.2/bits/stl_algobase.h: 241: no
match for ` std::back_inser t_iterator<std: :string>& =
std::basic_stri ng<char, std::char_trait s<char>,
std::allocator< char> >&' operator
/usr/include/c++/3.2.2/bits/stl_iterator.h: 355:
candidates are: std::back_inser t_iterator<_Con tainer>&
std::back_inser t_iterator<_Con tainer>::operat or=(_Container: :const_referenc e )
[with _Container = std::string]
/usr/include/c++/3.2.2/bits/stl_iterator.h: 330:
std::back_inser t_iterator<std: :string>&
std::back_inser t_iterator<std: :string>::opera tor=(const
std::back_inser t_iterator<std: :string>&)
'back_insert_it erator' requires that the container type
specified by its template argument defines members
'push_back()' and 'value_type'. 'std::string' defines the
latter, but not the former.
IOW you cannot use 'back_insert_it erator' with a
'std::string'. ('std::string', while sharing much
commonality with them, isn't strictly a 'container').
-Mike
Argh.
From "Accelerate d C++", pg 121:
"back_inserter( c)
Yields an iterator on the container c that appends elements to c. The
container must support push_back, which the list, vector, and the string
types all do."
Joe Laughlin wrote: Mike Wahler wrote: "Joe Laughlin" <Jo************ ***@boeing.com> wrote in
message news:I6******** @news.boeing.co m... Joe Laughlin wrote:
These weird errors just keep on coming! Thanks everyone
again for your help.
Please don't tell me this error is because of const
again... :-( But I'd wager it is.
Not this time. :-)
See below.
// 6-9 from Accelerated C++
// Use library algorithm to cat all elements of a
vector<string>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
int main()
{
std::vector<std ::string> vec;
vec.push_back(" Hi!");
vec.push_back(" How ");
vec.push_back(" are ");
vec.push_back(" you ");
vec.push_back(" doing?");
std::string new_string;
copy(vec.begin( ), vec.end(),
std::back_inser ter(new_string) );
std::cout << new_string << std::endl;
return 0;
}
g++ -Wall -pedantic -o 6-9 6-9.cpp
/usr/include/c++/3.2.2/bits/stl_algobase.h: In function
`_OutputIter std::__copy(_Ra ndomAccessIter,
_RandomAccessIt er, _OutputIter,
std::random_acc ess_iterator_ta g) [with
_RandomAccessIt er = std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]':
/usr/include/c++/3.2.2/bits/stl_algobase.h: 260:
instantiated from `_OutputIter
std::__copy_aux 2(_InputIter, _InputIter, _
OutputIter, __false_type) [with _InputIter =
std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 303:
instantiated from `_OutputIter
std::__copy_ni2 (_InputIter, _InputIter, _O
utputIter, __false_type) [with _InputIter =
std::string*, _OutputIter =
std::back_inser t_iterator<std: :string>]'
/usr/include/c++/3.2.2/bits/stl_algobase.h: 314:
instantiated from `_OutputIter
std::__copy_ni1 (_InputIter, _InputIter, _O
utputIter, __true_type) [with _InputIter =
__gnu_cxx::__no rmal_iterator<s td::string*,
std::vector<std ::string, std::allocat
or<std::string> > >, _OutputIter =
std::back_inser t_iterator<std: :string>]' /usr/include/c++/3.2.2/bits/stl_algobase.h: 349:
instantiated from `_OutputIter std::copy(_Inpu tIter,
_InputIter, _OutputI
ter) [with _InputIter =
__gnu_cxx::__no rmal_iterator<s td::string*,
std::vector<std ::string, std::allocator< std::string> > >
, _OutputIter = std::back_inser t_iterator<std: :string>]'
6-9.cpp:22: instantiated from here
/usr/include/c++/3.2.2/bits/stl_algobase.h: 241: no
match for ` std::back_inser t_iterator<std: :string>& =
std::basic_stri ng<char, std::char_trait s<char>,
std::allocator< char> >&' operator
/usr/include/c++/3.2.2/bits/stl_iterator.h: 355:
candidates are: std::back_inser t_iterator<_Con tainer>&
std::back_inser t_iterator<_Con tainer>::operat or=(_Container: :const_referenc e )
[with _Container = std::string]
/usr/include/c++/3.2.2/bits/stl_iterator.h: 330:
std::back_inser t_iterator<std: :string>&
std::back_inser t_iterator<std: :string>::opera tor=(const
std::back_inser t_iterator<std: :string>&)
'back_insert_it erator' requires that the container type
specified by its template argument defines members
'push_back()' and 'value_type'. 'std::string' defines the
latter, but not the former.
IOW you cannot use 'back_insert_it erator' with a
'std::string'. ('std::string', while sharing much
commonality with them, isn't strictly a 'container').
-Mike
Argh.
From "Accelerate d C++", pg 121:
"back_inserter( c)
Yields an iterator on the container c that appends
elements to c. The container must support push_back,
which the list, vector, and the string types all do."
So, was the book correct? Or wrong?
"Joe Laughlin" <Jo************ ***@boeing.com> wrote in message
news:I6******** @news.boeing.co m... Joe Laughlin wrote:
From "Accelerate d C++", pg 121:
"back_inserter( c)
Yields an iterator on the container c that appends
elements to c. The container must support push_back,
which the list, vector, and the string types all do."
So, was the book correct? Or wrong?
I think it's wrong. As far as I can tell from the standard,
'std::basic_str ing<>' is not required to provide 'push_back()',
but neither is it prohibited from doing so.
Of course I invite anyone else to give their interpretation,
so we can know for sure.
I scanned the AC++ errata pages, but I don't see this issue
mentioned.
Anyone else?
-Mike
Mike Wahler wrote: "Joe Laughlin" <Jo************ ***@boeing.com> wrote in message
news:I6******** @news.boeing.co m...
Joe Laughlin wrote:
From "Accelerate d C++", pg 121:
"back_insert er(c)
Yields an iterator on the container c that appends
elements to c. The container must support push_back,
which the list, vector, and the string types all do."
So, was the book correct? Or wrong?
I think it's wrong. As far as I can tell from the standard,
'std::basic_str ing<>' is not required to provide 'push_back()',
but neither is it prohibited from doing so.
ISO/IEC 14882 1998, p385
// 21.3.5: modifiers
....
void push_back (charT);
Of course I invite anyone else to give their interpretation,
so we can know for sure.
I scanned the AC++ errata pages, but I don't see this issue
mentioned.
Anyone else?
"Buster" <no**@none.co m> wrote in message
news:cl******** **@newsg2.svr.p ol.co.uk... Mike Wahler wrote: "Joe Laughlin" <Jo************ ***@boeing.com> wrote in message
news:I6******** @news.boeing.co m...
I think it's wrong. As far as I can tell from the standard,
'std::basic_str ing<>' is not required to provide 'push_back()',
but neither is it prohibited from doing so.
ISO/IEC 14882 1998, p385
// 21.3.5: modifiers
...
void push_back (charT);
But that's the *only* mention of it. For all the other
member functions, there is a description of behavior.
Not for this one. ???
-Mike
Mike Wahler wrote in news:6fRfd.4096 $kM.1575
@newsread3.news .pas.earthlink. net in comp.lang.c++:
"Buster" <no**@none.co m> wrote in message
news:cl******** **@newsg2.svr.p ol.co.uk... Mike Wahler wrote: > "Joe Laughlin" <Jo************ ***@boeing.com> wrote in message
> news:I6******** @news.boeing.co m... > I think it's wrong. As far as I can tell from the standard,
> 'std::basic_str ing<>' is not required to provide 'push_back()',
> but neither is it prohibited from doing so.
ISO/IEC 14882 1998, p385
// 21.3.5: modifiers
...
void push_back (charT);
But that's the *only* mention of it. For all the other
member functions, there is a description of behavior.
Not for this one. ???
21.3/2
The class template basic_string conforms to the requirements of a
Sequence, as specified in (23.1.1). Additionally, because the
iterators supported by basic_string are random access iterators
(24.1.5), basic_string conforms to the the requirements of a
Reversible Container, as specified in (23.1).
Table 68 - Optional Sequence operations (23.1.1/12) describes push_back.
Presunmably its only because its optional that its mentioned in 21.3.5
at all.
Rob.
-- http://www.victim-prime.dsl.pipex.com/
"Mike Wahler" <mk******@mkwah ler.net> wrote in message news:<6f******* *********@newsr ead3.news.pas.e arthlink.net>.. .
[ ... ] // 21.3.5: modifiers
...
void push_back (charT);
But that's the *only* mention of it. For all the other
member functions, there is a description of behavior.
Not for this one. ???
Theoretically, it's handled by ($21.3/2):
The template class basic_string conforms to the requirements
of a Sequence, as specified in (23.1.1).
Unfortunately, 23.1.1/12 also only mentions the existence of
push_back, and leaves describing it in any detail for the individual
container classes that provide it -- but (of course) not including
string...
--
Later,
Jerry.
The universe is a figment of its own imagination. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
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by: jinu1996 |
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In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
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by: Hystou |
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Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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by: tracyyun |
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Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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by: adsilva |
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A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: 6302768590 |
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Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
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by: muto222 |
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How can i add a mobile payment intergratation into php mysql website.
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