无法与'operator !='匹敌
no match for 'operator !='
c newbie的问题。如果我是一个简单的话，请原谅我。
我正在尝试运行一个 *.cpp代码，该代码读取文本文件并输出格式的文件。但是，在运行代码时，我会遇到一些汇编错误。我已经附上了代码和错误。
代码：
#include<iostream>
#include<iomanip>
#include<fstream>
const int cell = 1;
using namespace std;
int main()
{
int id[cell],crop[cell],n;
double root_depth1[cell], root_depth2[cell], root_depth3[cell], root_fract1[cell], root_fract2[cell], root_fract3[cell], x;
double LAI_1[cell],LAI_2[cell],LAI_3[cell],LAI_4[cell],LAI_5[cell],LAI_6[cell];
double LAI_7[cell], LAI_8[cell], LAI_9[cell], LAI_10[cell], LAI_11[cell], LAI_12[cell];
ifstream read;
read.open("veg_par_in.txt");
if(read != 0)
{
for (int i=0;i<cell;i++)
{
read>>id[i]>>crop[i]>>root_depth1[i]>>root_fract1[cell]>>root_depth2[cell]>>root_fract2[cell]>>root_depth3[cell]>>root_fract3[cell];
read>>LAI_1[i]>>LAI_2[i]>>LAI_3[i]>>LAI_4[i]>>LAI_5[i]>>LAI_6[i];
read>>LAI_7[i]>>LAI_8[i]>>LAI_9[i]>>LAI_10[i]>>LAI_11[i]>>LAI_12[i];
}
read.close();
ofstream write;
write.open("veg_par.txt");
for(int j=0;j<cell;j++)
{
write<<id[j]<<" "<<1<<endl;
write<<right<<setw(5)<<crop[j]<<" "<<fixed<<setprecision(6)<<float(1)<<fixed<<setprecision(2)<<" "<<root_depth1[j]<<" "<<root_fract1[cell];
write<<" "<<root_depth2[cell]<<" "<<root_fract2[cell]<<" "<<root_depth3[cell]<<" "<<root_fract3[cell]<<endl;
write<<" "<<fixed<<setprecision(3)<<LAI_1[j]<<" "<<LAI_2[j]<< " "<<LAI_3[j]<<" "<<LAI_4[j]<<" "<<LAI_5[j]<," "<<LAI_6[j];
write<<" "<<LAI_7[j]<<" "<<LAI_8[j]<<" "<<LAI_9[j]<<" "<<LAI_10[j]<<" "<<LAI_11[j]<<" "<<LAI_12[j]<<endl;
}
write.close();
}
else
cout<<"veg_par_in.txt file is missing.";
}
错误消息：
veg_par.cpp: In function ‘int main()’:
veg_par.cpp:17:10: error: no match for ‘operator!=’ (operand types are ‘std::ifstream {aka std::basic_ifstream<char>}’ and ‘int’)
if(read != 0)
veg_par.cpp:17:10: note: candidate: operator!=(int, int) <built-in>
veg_par.cpp:17:10: note: no known conversion for argument 1 from ‘std::ifstream {aka std::basic_ifstream<char>}’ to ‘in ’
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iosfwd:40:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/postypes.h:221:5: note: candidate: template<class _StateT> bool std::
operator!=(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/postypes.h:221:5: note: template argument deduction/substitution fa iled:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::fpos<_StateT>’
if(read != 0)
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_algobase.h:64:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/char_traits.h:39,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_pair.h:448:5: note: candidate: template<class _T1, class _T2> con stexpr bool std::operator!=(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_pair.h:448:5: note: template argument deduction/substitution fa iled:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::pair<_T1, _T2>’
if(read != 0)In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_algobase.h:67:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/char_traits.h:39,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_iterator.h:304:5: note: candidate: template<class _Iterator> bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
operator!=(const reverse_iterator<_Iterator>& __x,
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_iterator.h:304:5: note: template argument deduction/substitutio n failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::reverse_iterato r<_Iterator>’
if(read != 0)
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_algobase.h:67:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/char_traits.h:39,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_iterator.h:361:5: note: candidate: template<class _IteratorL, cla ss _IteratorR> bool std::operator!=(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
operator!=(const reverse_iterator<_IteratorL>& __x,
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_iterator.h:361:5: note: template argument deduction/substitutio n failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::reverse_iterato r<_Iterator>’
if(read != 0)
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_algobase.h:67:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/char_traits.h:39,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_iterator.h:1125:5: note: candidate: template<class _IteratorL, cl ass _IteratorR> bool std::operator!=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
operator!=(const move_iterator<_IteratorL>& __x,
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_iterator.h:1125:5: note: template argument deduction/substituti on failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::move_iterator<_ IteratorL>’
if(read != 0)
^In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_algobase.h:67:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/char_traits.h:39,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_iterator.h:1131:5: note: candidate: template<class _Iterator> boo l std::operator!=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)
operator!=(const move_iterator<_Iterator>& __x,
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/stl_iterator.h:1131:5: note: template argument deduction/substituti on failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::move_iterator<_ IteratorL>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/string:41:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_classes.h:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/ios_base.h:41,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:42,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/allocator.h:158:5: note: candidate: template<class _T1, class _T2> bo ol std::operator!=(const std::allocator<_CharT>&, const std::allocator<_T2>&)
operator!=(const allocator<_T1>&, const allocator<_T2>&)
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/allocator.h:158:5: note: template argument deduction/substitution f ailed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::allocator<_Char T>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/string:41:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_classes.h:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/ios_base.h:41,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:42,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/allocator.h:164:5: note: candidate: template<class _Tp> bool std::ope rator!=(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
operator!=(const allocator<_Tp>&, const allocator<_Tp>&)
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/allocator.h:164:5: note: template argument deduction/substitution f ailed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::allocator<_Char T>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/string:52:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_classes.h:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/ios_base.h:41,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:42,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/basic_string.h:5112:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_Ch arT, _Traits, _Alloc>&)
operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/basic_string.h:5112:5: note: template argument deduction/substituti on failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::basic_string<_C harT, _Traits, _Alloc>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/string:52:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_classes.h:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/ios_base.h:41,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:42,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/basic_string.h:5125:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator!=(const _CharT* __lhs,
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/basic_string.h:5125:5: note: template argument deduction/substituti on failed:
veg_par.cpp:17:13: note: mismatched types ‘const _CharT*’ and ‘std::basic_ifstream<char>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/string:52:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_classes.h:40,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/ios_base.h:41,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:42,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/basic_string.h:5137:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/basic_string.h:5137:5: note: template argument deduction/substituti on failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::basic_string<_C harT, _Traits, _Alloc>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/ios_base.h:46:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:42,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/system_error:311:3: note: candidate: bool std::operator!=(const std::error _code&, const std::error_code&)
operator!=(const error_code& __lhs, const error_code& __rhs) noexcept
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/system_error:311:3: note: no known conversion for argument 1 from ‘std:: ifstream {aka std::basic_ifstream<char>}’ to ‘const std::error_code&’
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/system_error:315:3: note: candidate: bool std::operator!=(const std::error _code&, const std::error_condition&)
operator!=(const error_code& __lhs, const error_condition& __rhs) noexcept
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/system_error:315:3: note: no known conversion for argument 1 from ‘std:: ifstream {aka std::basic_ifstream<char>}’ to ‘const std::error_code&’
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/system_error:319:3: note: candidate: bool std::operator!=(const std::error _condition&, const std::error_code&)
operator!=(const error_condition& __lhs, const error_code& __rhs) noexcept
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/system_error:319:3: note: no known conversion for argument 1 from ‘std:: ifstream {aka std::basic_ifstream<char>}’ to ‘const std::error_condition&’
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/system_error:323:3: note: candidate: bool std::operator!=(const std::error _condition&, const std::error_condition&)
operator!=(const error_condition& __lhs,
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/system_error:323:3: note: no known conversion for argument 1 from ‘std:: ifstream {aka std::basic_ifstream<char>}’ to ‘const std::error_condition&’
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_facets.h:48:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/basic_ios.h:37,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ios:44,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/ostream:38,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iostream:39,
from veg_par.cpp:2:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/streambuf_iterator.h:210:5: note: candidate: template<class _CharT, c lass _Traits> bool std::operator!=(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT , _Traits>&)
operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/streambuf_iterator.h:210:5: note: template argument deduction/subst itution failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::istreambuf_iter ator<_CharT, _Traits>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/tuple:39:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/unique_ptr.h:37,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_conv.h:41,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/locale:43,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iomanip:43,
from veg_par.cpp:3:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/array:246:5: note: candidate: template<class _Tp, long unsigned int _Nm> b ool std::operator!=(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
operator!=(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/array:246:5: note: template argument deduction/substitution failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::array<_Tp, _Nm ’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/unique_ptr.h:37:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_conv.h:41,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/locale:43,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iomanip:43,
from veg_par.cpp:3:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/tuple:1367:5: note: candidate: template<class ... _TElements, class ... _U Elements> constexpr bool std::operator!=(const std::tuple<_Elements ...>&, const std::tuple<_Elements ...>&)
operator!=(const tuple<_TElements...>& __t,
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/tuple:1367:5: note: template argument deduction/substitution failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::tuple<_Elements ...>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_conv.h:41:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/locale:43,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iomanip:43,
from veg_par.cpp:3:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/unique_ptr.h:667:5: note: candidate: template<class _Tp, class _Dp, c lass _Up, class _Ep> bool std::operator!=(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)
operator!=(const unique_ptr<_Tp, _Dp>& __x,
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/unique_ptr.h:667:5: note: template argument deduction/substitution failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::unique_ptr<_Tp, _Dp>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_conv.h:41:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/locale:43,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iomanip:43,
from veg_par.cpp:3:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/unique_ptr.h:673:5: note: candidate: template<class _Tp, class _Dp> b ool std::operator!=(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)
operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/unique_ptr.h:673:5: note: template argument deduction/substitution failed:
veg_par.cpp:17:13: note: ‘std::ifstream {aka std::basic_ifstream<char>}’ is not derived from ‘const std::unique_ptr<_Tp, _Dp>’
if(read != 0)
^
In file included from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/locale_conv.h:41:0,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/locale:43,
from /usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/iomanip:43,
from veg_par.cpp:3:
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/unique_ptr.h:678:5: note: candidate: template<class _Tp, class _Dp> b ool std::operator!=(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)
operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
^~~~~~~~
/usr/lib/gcc/x86_64-pc-cygwin/6.4.0/include/c++/bits/unique_ptr.h:678:5: note: template argument deduction/substitution failed:
veg_par.cpp:17:13: note: mismatched types ‘const std::unique_ptr<_Tp, _Dp>’ and ‘int’
if(read != 0)
^
veg_par.cpp:34:109: error: expected primary-expression before ‘,’ token
write<<" "<<fixed<<setprecision(3)<<LAI_1[j]<<" "<<LAI_2[j]<< " "<<LAI_3[j]<<" "<<LAI_4[j]<<" "<<LAI_5[j]<," "<<LAI_6[j ];
^
veg_par.cpp:34:113: error: invalid operands of types ‘const char [2]’ and ‘double’ to binary ‘operator<<’
write<<" "<<fixed<<setprecision(3)<<LAI_1[j]<<" "<<LAI_2[j]<< " "<<LAI_3[j]<<" "<<LAI_4[j]<<" "<<LAI_5[j]<," "<<LAI_6[j ];
~~~^~~~~~~~~ ~
第一个错误说与操作数类型char and int没有匹配的"操作器！="。我一直在研究这个错误，发现这可能与操作员进行比较两种类型的操作数类型有关。在这里，"读取"是一个流变量，它具有CHAR的数据类型，并且操作员正在比较两种数据类型。我很确定运行此代码时的所有错误都是由操作员比较两种数据类型的。
我使用" g -g veg_par.cpp -o a.exe"进行编译。
如何解决此错误？任何帮助都将不胜感激。
第一个错误说与操作数类型char和int
的"运算符！="没有匹配
不完全。您的问题在于此表达式read != 0。它试图将std::ifstream与int进行比较。由于前者是类型，因此必须通过考虑以及任何用户定义的转换为int。没有这样的转换，也没有定义operator!=。所以你不能写这样的比较。
现在，这并不意味着您在if statement条件下使用read。这只是意味着您必须以一种支持的方式使用它。那些是if(read)和if(!read)。std::ifstream还有一个operator!，也允许上下文转换为bool。
相关文章：
- 为什么 std：：optional：：operator=(U&&) 要求你是非标量类型？
- 'operator='已弃用：改用 QDir：：setPath()
- 过载'operator new'如何导致无限循环？
- 与'operator='不匹配(操作数类型'String'且"void")
- SegFault 同时使用 std::string::operator+= 和函数作为参数
- 处理"no operator found"
- 如何编写 operator= 用于使用虚拟方法与非平凡成员的匿名联合
- 运算符重载："operator+"必须采用零个或一个参数
- 使用 operator(） 扩展 Eigen::EigenBase
- 错误消息：使用"string* +="后"no match for 'operator+='"
- 有没有办法修改'operator->'，以便'z->im'返回复数的虚部
- "operator +="行为异常的定义
- C++ "error: use of overloaded operator '*' is ambiguous"似乎只有一场比赛
- 无法与'operator !='匹敌
- 无法与'operator='匹敌
- C++'operator='无法匹敌
- 在'* __result = * __first'中无法与'operator='匹敌
- QVector 无法与'operator='匹敌
- STL C++：无法与'operator*'匹敌
- 无法与'operator=='匹敌
