为什么不是运营商<<发现了什么？ [英] Why isn't the operator<< found?
问题描述
大家好，
我正在尝试使用istream_iterators来读取由一对组成的文件
的数字。为此，我写了以下内容：
#include< fstream>
#include< vector>
＃ include< iterator>
using namespace std;
typedef std :: pair< double，double> float_pair;
std :: istream&运营商GT;> （std :: istream& s，
std :: pair< double，double>& p）
{
s>> p.first;
s>> p.second;
返回s;
}
main（）{
ifstream文件（" filename"）;
float_pair p;
file>>磷; //这个有效
std :: vector< float_pair>位置//但这不是
（istream_iterator< float_pair>（文件），
（istream_iterator< float_pair>（）））;
}
这曾经在我的旧编译器（KCC）下运行，但是GCC 4.0说它不能找到运算符<< （我认为...）完整的错误信息如下。
然而，操作员工作是因为当我尝试阅读一个单独的
对时，它可以工作。是否需要为
istream_iterator执行一些魔术才能找到运算符<< ;?
谢谢，
/ Patrik Jonsson
[patrik @ governator src] $ g ++ optest.cc
/usr/lib/gcc/x86_64-redhat-linux/4.0.0 /../../../../include/c++/4.0.0/bits/stream_iterator.h:
在成员函数''void std :: istream_iterator< _Tp，_CharT， _Traits，
_Dist> :: _ M_read（）[with _Tp = float_pair，_CharT = char，_Traits =
std :: char_traits< char>，_Dist = ptrdiff_t]' '：
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/bits/stream_iterator .h：68：
实例化''std :: istream_iterator< _Tp，_CharT，_Traits，
_Dist> :: istream_iterator（std :: basic_istream< _CharT，_Traits> ;&）[与
_Tp = float_pair，_CharT = char，_Traits = std :: char_traits< char>，
_Dist = ptrdiff_t]''
optest.cc:24：instan来自这里
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/bits/ stream_iterator.h：119：
错误：''运算符>>''不匹配
''*（（std :: istream_iterator< float_pair，char， std :: char_traits< char>，
ptrdiff_t> *）this） - > std :: istream_iterator< float_pair，char，
std :: char_traits< char>， ptrdiff_t> :: _ M_stream>>
（（std :: istream_iterator< float_pair，char，std :: char_traits< char>，
ptrdiff_t> *）this） - > std :: istream_iterator< float_pair，char，
std :: char_traits< char> ;, ptrdiff_t> :: _ M_value''
/ usr / lib / gcc / x86_64-redhat-linux / 4.0.0 /../../../../ include / c ++ / 4.0.0 / istream：131：
注意：候选人是：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，
_Traits> :: operator>>（std :: basic_istream< _CharT，_Traits>& ;
（*）（std :: basic_i stream< _CharT，_Traits>&））[with _CharT = char，_Traits
= std :: char_traits< char>]
/ usr / lib / gcc / x86_64 -redhat-linux / 4.0.0 /../../../../ include / c ++ / 4.0.0 / istream：134：
注意：std :: basic_istream< _CharT， _Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（std :: basic_ios< _CharT，
_Traits>& （*）（std :: basic_ios< _CharT，_Traits>&））[with _CharT = char，
_Traits = std :: char_traits< char>]
/ usr / lib / gcc / x86_64-redhat-linux / 4.0.0 /../../../../ include / c ++ / 4.0.0 / istream：137：
注意： std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（std :: ios_base&
（* ）（std :: ios_base&））[with _CharT = char，_Traits =
std :: char_traits< char>]
/ usr / lib / gcc / x86_64- redhat-linux / 4.0.0 /../../../../ include / c ++ / 4.0.0 / istream：169：
注意：std :: basic_istream< _CharT，_Traits> ;&
std :: basic_istream< _CharT，_Traits> :: operator>>（bool&）[与_CharT =
char，_Traits = std :: char_traits< ; char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream ：172：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（short int&）[with
_CharT = char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:175：
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（short unsigned int&）
[_CharT = char，_ Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../ ../../include/c++/4.0.0/istream:178:
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（int&）[with _CharT =
char，_Traits = std :: char_traits< char>]
/ usr /lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:181:
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（unsigned int&）[with
_CharT = char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:184：
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long int&）[with _CharT
= char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../ .. /../include/c++/4.0.0/istream:187:
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long unsigned int&）
[with _CharT = char，_Traits = std :: char_traits< char>]
/ usr /lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:191：
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long long int&）[with
_CharT = char，_Traits = std :: char_traits< char> ]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:194：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long long unsigned
int&）[with _CharT = char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/ ../../../../include/c++/4.0.0/istream:198:
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（float&）[with _CharT =
char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:201：
note：std :: basic_istream< _CharT，_Traits> &
std :: basic_istream< _CharT，_Traits> :: operator>>（double&）[with _CharT =
char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream： 204：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long double& ）[with
_CharT = char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/ ../../../../include/c++/4.0.0/istream:207：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（void *&）[with _CharT =
char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:230:
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，
_Traits> :: operator>>（std :: basic_streambuf< _CharT，_Traits> *）[with
_CharT = char，_ Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../。 ./include/c++/4.0.0/istream:688:
注意：std :: basic_istream< char，_Traits>&
std :: operator>> （std :: basic_istream< char，_Traits>& ;, unsigned char&）
[with _Traits = std :: char_traits< char>]
/ usr / lib / gcc / x86_64-redhat-linux / 4.0.0 /../../../../ include / c ++ / 4.0.0 / istream：693：
注意：std :: basic_istream< ; char，_Traits>&
std :: operator>>（std :: basic_istream< char，_Traits>& ;, signed char&）[with
_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/ 4.0.0 / istream：729：
注意：std :: basic_istream< cha r，_Traits>&
std :: operator>>（std :: basic_istream< char，_Traits>& ;, unsigned char *）
[with _Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0 .0 / istream：734：
注意：std :: basic_istream< char，_Traits>&
std :: operator>>（std :: basic_istream< char ，_Traits>& ;, signed char *）[with
_Traits = std :: char_traits< char>]
g ++ optest.cc
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/ 4.0.0 / bits / stream_iterator.h：
在成员函数''void std :: istream_iterator< _Tp，_CharT，_Traits，
_Dist> :: _ M_read（） [使用_Tp = float_pair，_CharT = char，_Traits =
std :: char_traits< char>，_ Dist = ptrdiff_t]''：
/ usr / lib / gcc / x86_64的-红帽-LINUX / 4.0.0 /../../../../包括/ C ++ / 4.0.0 /比特/ STRE am_iterator.h：68：
实例化''std :: istream_iterator< _Tp，_CharT，_Traits，
_Dist> :: istream_iterator（std :: basic_istream< _CharT， _Traits>&）[with
_Tp = float_pair，_CharT = char，_Traits = std :: char_traits< char>，
_Dist = ptrdiff_t]''
optest.cc:24：从这里实例化
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../ .. /include/c++/4.0.0/bits/stream_iterator.h:119：
错误：''运营商>>''不匹配
''* （（std :: istream_iterator< float_pair，char，std :: char_traits< char>，
ptrdiff_t> *）this） - > std :: istream_iterator< float_pair，char，
std :: char_traits< char> ;, ptrdiff_t> :: _ M_stream>>
（（std :: istream_iterator< float_pair，char，std :: char_traits< char>，
ptrdiff_t> *）this） - > std :: istream_iterator< float_pair，char，
std :: char_traits< char>，ptrdiff_t&g t; :: _ M_value''
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0。 0 / istream：131：
注意：候选人是：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，
_Traits> :: operator>>（std :: basic_istream< _CharT，_Traits>&
（*）（std :: basic_istream< _CharT，_Traits>&））[with _CharT = char，_Traits
= std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../ ../../../include/c++/4.0.0/istream:134：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（std :: basic_ios< _CharT，
_Traits>& （*）（std :: basic_ios< _CharT，_Traits>&））[with _CharT = char，
_Traits = std :: char_traits< char>]
/ usr / lib / gcc / x86_64-redhat-linux / 4.0.0 /../../../../ include / c ++ / 4.0.0 / istream：137：
注意： std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（std :: ios_base&
（* ）（std :: ios_base&））[with _CharT = char，_Traits =
std :: char_traits< char>]
/ usr / lib / gcc / x86_64- redhat-linux / 4.0.0 /../../../../ include / c ++ / 4.0.0 / istream：169：
注意：std :: basic_istream< _CharT，_Traits> ;&
std :: basic_istream< _CharT，_Traits> :: operator>>（bool&）[与_CharT =
char，_Traits = std :: char_traits< ; char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream ：172：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（short int&）[with
_CharT = char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:175：
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（short unsigned int&）
[_CharT = char，_ Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../ ../../include/c++/4.0.0/istream:178:
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（int&）[with _CharT =
char，_Traits = std :: char_traits< char>]
/ usr /lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:181:
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（unsigned int&）[with
_CharT = char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:184：
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long int&）[with _CharT
= char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../ .. /../include/c++/4.0.0/istream:187:
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long unsigned int&）
[with _CharT = char，_Traits = std :: char_traits< char>]
/ usr /lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:191：
note：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long long int&）[with
_CharT = char，_Traits = std :: char_traits< char> ]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:194：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long long unsigned
int&）[with _CharT = char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/ ../../../../include/c++/4.0.0/istream:198:
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（float&）[with _CharT =
char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:201：
note：std :: basic_istream< _CharT，_Traits> &
std :: basic_istream< _CharT，_Traits> :: operator>>（double&）[with _CharT =
char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream： 204：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（long double& ）[with
_CharT = char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/ ../../../../include/c++/4.0.0/istream:207：
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，_Traits> :: operator>>（void *&）[with _CharT =
char，_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:230:
注意：std :: basic_istream< _CharT，_Traits>&
std :: basic_istream< _CharT，
_Traits> :: operator>>（std :: basic_streambuf< _CharT，_Traits> *）[with
_CharT = char，_ Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../。 ./include/c++/4.0.0/istream:688:
注意：std :: basic_istream< char，_Traits>&
std :: operator>> （std :: basic_istream< char，_Traits>& ;, unsigned char&）
[with _Traits = std :: char_traits< char>]
/ usr / lib / gcc / x86_64-redhat-linux / 4.0.0 /../../../../ include / c ++ / 4.0.0 / istream：693：
注意：std :: basic_istream< ; char，_Traits>&
std :: operator>>（std :: basic_istream< char，_Traits>& ;, signed char&）[with
_Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/ 4.0.0 / istream：729：
注意：std :: basic_istream< cha r，_Traits>&
std :: operator>>（std :: basic_istream< char，_Traits>& ;, unsigned char *）
[with _Traits = std :: char_traits< char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0 .0 / istream：734：
注意：std :: basic_istream< char，_Traits>&
std :: operator>>（std :: basic_istream< char ，_Traits>& ;, signed char *）[with
_Traits = std :: char_traits< char>]
lutorm写道：
大家好，
我正在尝试使用istream_iterators来读取由数字对组成的文件。为此，我写了以下内容：
#include< fstream>
#include< vector>
#include< iterator>
....
我不知道你是否错误地复制了代码，或者你想要的代码是什么？
post有一个括号在错误的地方。请注意，我使用了GCC 3.3.5
和GCC 4.0.1。您可能想要获得最新的次要版本。
cat main.cpp
#include< fstream>
#include< vector>
#include< iterator>
#include< istream>
使用命名空间std;
typedef std :: pair< double，double> float_pair;
std :: istream&运营商GT;> （std :: istream& s，
std :: pair< double，double>& p）
{
s>> p.first;
s>> p.second;
返回s;
}
main（）{
ifstream文件（" filename"）;
float_pair p;
file>>磷; //这个有效
std :: vector< float_pair>位置//但这不是
（istream_iterator< float_pair>（文件），istream_iterator< float_pair>（））;
}
Hi everyone,
I''m trying to use istream_iterators to read a file consisting of pairs
of numbers. To do this, I wrote the following:
#include <fstream>
#include <vector>
#include <iterator>
using namespace std;
typedef std::pair<double, double> float_pair;
std::istream& operator>> (std::istream& s,
std::pair<double, double>& p)
{
s >> p.first;
s >> p.second;
return s;
}
main(){
ifstream file ("filename");
float_pair p;
file >> p; // this works
std::vector<float_pair> positions // but this doesn''t
(istream_iterator<float_pair> (file),
(istream_iterator<float_pair> ()));
}
This used to work under my old compiler (KCC) but GCC 4.0 says it can''t
find the operator<< (I think...) The full error message is below.
However, the operator works because when I try to read an individual
pair it works. Is there some magic that needs to be performed for the
istream_iterator to find the operator<<?
Thanks,
/Patrik Jonsson
[patrik@governator src]$ g++ optest.cc
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/bits/stream_iterator.h:
In member function ''void std::istream_iterator<_Tp, _CharT, _Traits,
_Dist>::_M_read() [with _Tp = float_pair, _CharT = char, _Traits =
std::char_traits<char>, _Dist = ptrdiff_t]'':
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/bits/stream_iterator.h:68:
instantiated from ''std::istream_iterator<_Tp, _CharT, _Traits,
_Dist>::istream_iterator(std::basic_istream<_CharT , _Traits>&) [with
_Tp = float_pair, _CharT = char, _Traits = std::char_traits<char>,
_Dist = ptrdiff_t]''
optest.cc:24: instantiated from here
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/bits/stream_iterator.h:119:
error: no match for ''operator>>'' in
''*((std::istream_iterator<float_pair, char, std::char_traits<char>,
ptrdiff_t>*)this)->std::istream_iterator<float_pair, char,
std::char_traits<char>, ptrdiff_t>::_M_stream >>
((std::istream_iterator<float_pair, char, std::char_traits<char>,
ptrdiff_t>*)this)->std::istream_iterator<float_pair, char,
std::char_traits<char>, ptrdiff_t>::_M_value''
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:131:
note: candidates are: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT,
_Traits>::operator>>(std::basic_istream<_CharT, _Traits>&
(*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits
= std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:134:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(std::basic_ios<_CharT,
_Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char,
_Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:137:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base&
(*)(std::ios_base&)) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:169:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:172:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:175:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&)
[with _CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:178:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:181:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:184:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT
= char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:187:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&)
[with _CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:191:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:194:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned
int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:198:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:201:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:204:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:207:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:230:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT,
_Traits>::operator>>(std::basic_streambuf<_CharT, _Traits>*) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:688:
note: std::basic_istream<char, _Traits>&
std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)
[with _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:693:
note: std::basic_istream<char, _Traits>&
std::operator>>(std::basic_istream<char, _Traits>&, signed char&) [with
_Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:729:
note: std::basic_istream<char, _Traits>&
std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)
[with _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:734:
note: std::basic_istream<char, _Traits>&
std::operator>>(std::basic_istream<char, _Traits>&, signed char*) [with
_Traits = std::char_traits<char>]
g++ optest.cc
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/bits/stream_iterator.h:
In member function ''void std::istream_iterator<_Tp, _CharT, _Traits,
_Dist>::_M_read() [with _Tp = float_pair, _CharT = char, _Traits =
std::char_traits<char>, _Dist = ptrdiff_t]'':
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/bits/stream_iterator.h:68:
instantiated from ''std::istream_iterator<_Tp, _CharT, _Traits,
_Dist>::istream_iterator(std::basic_istream<_CharT , _Traits>&) [with
_Tp = float_pair, _CharT = char, _Traits = std::char_traits<char>,
_Dist = ptrdiff_t]''
optest.cc:24: instantiated from here
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/bits/stream_iterator.h:119:
error: no match for ''operator>>'' in
''*((std::istream_iterator<float_pair, char, std::char_traits<char>,
ptrdiff_t>*)this)->std::istream_iterator<float_pair, char,
std::char_traits<char>, ptrdiff_t>::_M_stream >>
((std::istream_iterator<float_pair, char, std::char_traits<char>,
ptrdiff_t>*)this)->std::istream_iterator<float_pair, char,
std::char_traits<char>, ptrdiff_t>::_M_value''
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:131:
note: candidates are: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT,
_Traits>::operator>>(std::basic_istream<_CharT, _Traits>&
(*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits
= std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:134:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(std::basic_ios<_CharT,
_Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char,
_Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:137:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base&
(*)(std::ios_base&)) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:169:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:172:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:175:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&)
[with _CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:178:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:181:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:184:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT
= char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:187:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&)
[with _CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:191:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:194:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned
int&) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:198:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:201:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:204:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:207:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:230:
note: std::basic_istream<_CharT, _Traits>&
std::basic_istream<_CharT,
_Traits>::operator>>(std::basic_streambuf<_CharT, _Traits>*) [with
_CharT = char, _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:688:
note: std::basic_istream<char, _Traits>&
std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)
[with _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:693:
note: std::basic_istream<char, _Traits>&
std::operator>>(std::basic_istream<char, _Traits>&, signed char&) [with
_Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:729:
note: std::basic_istream<char, _Traits>&
std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)
[with _Traits = std::char_traits<char>]
/usr/lib/gcc/x86_64-redhat-linux/4.0.0/../../../../include/c++/4.0.0/istream:734:
note: std::basic_istream<char, _Traits>&
std::operator>>(std::basic_istream<char, _Traits>&, signed char*) [with
_Traits = std::char_traits<char>]
lutorm wrote:
Hi everyone,
I''m trying to use istream_iterators to read a file consisting of pairs
of numbers. To do this, I wrote the following:
#include <fstream>
#include <vector>
#include <iterator> ....
I don''t know if you copied the code incorrectly, or the code you intended to
post had a parenthesis in the wrong place. Note that I used both GCC 3.3.5
and GCC 4.0.1. You may want to get the latest minor version.
cat main.cpp
#include <fstream>
#include <vector>
#include <iterator>
#include <istream>
using namespace std;
typedef std::pair<double, double> float_pair;
std::istream& operator>> (std::istream& s,
std::pair<double, double>& p)
{
s >> p.first;
s >> p.second;
return s;
}
main(){
ifstream file ("filename");
float_pair p;
file >> p; // this works
std::vector<float_pair> positions // but this doesn''t
(istream_iterator<float_pair> (file),istream_iterator<float_pair> ());
}
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