std::vector error
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From: Vladimir Grigoriev on 15 Dec 2009 09:57 Having the following code struct Point { Point( int i = 0, int j = 0 ): x( i ), y( j ) {} int x, y; }; #define MAX_SIZE 10 int _tmain(int argc, _TCHAR* argv[]) { std::vector<Point> v; v.reserve( MAX_SIZE ); for ( int i = 0; i < MAX_SIZE; ++i ) { v.push_back( Point( i, i ) ); } return 0; } I get the error error C2446: ':' : no conversion from 'const std::_Vector_iterator<_Ty,_Alloc>' to 'int' with [ _Ty=Point, _Alloc=std::allocator<Point> ] No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called : while compiling class template member function 'std::_Vector_iterator<_Ty,_Alloc> std::vector<_Ty>::insert(std::_Vector_iterator<_Ty,_Alloc>,const _Ty &)' with [ _Ty=Point, _Alloc=std::allocator<Point> ] The error occurs inside <vector> in this place iterator insert(iterator _Where, const _Ty& _Val) { // insert _Val at _Where size_type _Off = size() == 0 ? 0 : _Where - begin(); _Insert_n(_Where, (size_type)1, _Val); return (begin() + _Off); } What is the matter? Vladimir Grigoriev
From: Vladimir Grigoriev on 15 Dec 2009 10:15 I am sorry. The initial code is nor complete. I have found that the error occurs when I add the following template operator template <typename T> inline const T operator -( const T &lhs, const T &rhs ) { return ( T( lhs ) -= rhs ); } So the code should look the following way #include "stdafx.h" #include <iostream> #include <vector> struct Point { explicit Point( int i = 0, int j = 0 ): x( i ), y( j ) {} Point( const Point &rhs ): x( rhs.x ), y( rhs.y ) {} ~Point() {} Point & operator =( const Point &rhs ) { x = rhs.x; y = rhs.y; return ( *this ); } Point & operator -=( const Point &rhs ) { x -= rhs.x; y -= rhs.y; return ( *this ); } Point & operator --() { *this -= Point( 1, 1 ); return ( *this ); } const Point operator --( int ) { Point tmp = *this; --*this; return ( tmp ); } const Point operator -() const { return ( Point( -x, -y ) ); } int x, y; }; inline std::ostream & operator <<( std::ostream &os, const Point &rhs ) { os << "{" << rhs.x << ", " << rhs.y << "}"; return ( os ); } inline bool operator ==( const Point &lhs, const Point &rhs ) { return ( ( lhs.x == rhs.x ) && ( lhs.y == rhs.y ) ); } inline bool operator !=( const Point &lhs, const Point &rhs ) { return ( !( lhs == rhs ) ); } template <typename T> inline const T operator -( const T &lhs, const T &rhs ) { return ( T( lhs ) -= rhs ); } #define MAX_SIZE 10 int _tmain(int argc, _TCHAR* argv[]) { std::vector<Point> v; v.reserve( MAX_SIZE ); for ( int i = 0; i < MAX_SIZE; ++i ) { v.push_back( Point( i, i ) ); } return 0; } What is the matter? Vladimir Grigoriev
From: Victor Bazarov on 15 Dec 2009 10:12 Vladimir Grigoriev wrote: > Having the following code > > struct Point > > { > > Point( int i = 0, int j = 0 ): x( i ), y( j ) {} > > int x, y; > > }; > > #define MAX_SIZE 10 > > int _tmain(int argc, _TCHAR* argv[]) > > { > > std::vector<Point> v; I don't see '#include <vector>' anywhere in this program. Did you post the actual code? > > v.reserve( MAX_SIZE ); > > for ( int i = 0; i < MAX_SIZE; ++i ) > > { > > v.push_back( Point( i, i ) ); > > } > > > return 0; > > } > > I get the error > > error C2446: ':' : no conversion from 'const > std::_Vector_iterator<_Ty,_Alloc>' to 'int' > with > [ > _Ty=Point, > _Alloc=std::allocator<Point> > ] > No user-defined-conversion operator available that can perform this > conversion, or the operator cannot be called > > : while compiling class template member function > 'std::_Vector_iterator<_Ty,_Alloc> > std::vector<_Ty>::insert(std::_Vector_iterator<_Ty,_Alloc>,const _Ty &)' > with > [ > _Ty=Point, > _Alloc=std::allocator<Point> > ] > > > > The error occurs inside <vector> in this place > > > > iterator insert(iterator _Where, const _Ty& _Val) > > { // insert _Val at _Where > > size_type _Off = size() == 0 ? 0 : _Where - begin(); > > _Insert_n(_Where, (size_type)1, _Val); > > return (begin() + _Off); > > } > > > > What is the matter? Any chance you're using VC++ v6? If so, you're on your own. I don't see you use 'insert' in your code anywhere. Are you sure you've posted the code that you've compiled? V -- Please remove capital 'A's when replying by e-mail I do not respond to top-posted replies, please don't ask
From: Vladimir Grigoriev on 15 Dec 2009 10:18 I use Visual C++ 2005 EE. Vladimir Grigoriev
From: Vladimir Grigoriev on 15 Dec 2009 10:20
Victor, it is a good remark and I have presented already more detailed information. Vladimir Grigoriev "Victor Bazarov" <v.Abazarov(a)comAcast.net> wrote in message news:hg893g$ef5$1(a)news.datemas.de... > Vladimir Grigoriev wrote: >> Having the following code >> >> struct Point >> >> { >> >> Point( int i = 0, int j = 0 ): x( i ), y( j ) {} >> >> int x, y; >> >> }; >> >> #define MAX_SIZE 10 >> >> int _tmain(int argc, _TCHAR* argv[]) >> >> { >> >> std::vector<Point> v; > > I don't see '#include <vector>' anywhere in this program. Did you post > the actual code? > >> >> v.reserve( MAX_SIZE ); >> >> for ( int i = 0; i < MAX_SIZE; ++i ) >> >> { >> >> v.push_back( Point( i, i ) ); >> >> } >> >> >> return 0; >> >> } >> >> I get the error >> >> error C2446: ':' : no conversion from 'const >> std::_Vector_iterator<_Ty,_Alloc>' to 'int' >> with >> [ >> _Ty=Point, >> _Alloc=std::allocator<Point> >> ] >> No user-defined-conversion operator available that can perform >> this conversion, or the operator cannot be called >> >> : while compiling class template member function >> 'std::_Vector_iterator<_Ty,_Alloc> >> std::vector<_Ty>::insert(std::_Vector_iterator<_Ty,_Alloc>,const _Ty &)' >> with >> [ >> _Ty=Point, >> _Alloc=std::allocator<Point> >> ] >> >> >> >> The error occurs inside <vector> in this place >> >> >> >> iterator insert(iterator _Where, const _Ty& _Val) >> >> { // insert _Val at _Where >> >> size_type _Off = size() == 0 ? 0 : _Where - begin(); >> >> _Insert_n(_Where, (size_type)1, _Val); >> >> return (begin() + _Off); >> >> } >> >> >> >> What is the matter? > > Any chance you're using VC++ v6? If so, you're on your own. > > I don't see you use 'insert' in your code anywhere. Are you sure you've > posted the code that you've compiled? > > V > -- > Please remove capital 'A's when replying by e-mail > I do not respond to top-posted replies, please don't ask |