error: no matching function for call to 'std::reference_wrapper::reference_wrapper()
-2
Book and Article are derived classes from Medium.
Why am I getting this error when trying to insert Medium / Book / Article in the bibliography?
error: no matching function for call to '**std::reference_wrapper<Medium>::reference_wrapper()**
main.cc
#include <iostream>
using namespace std;
#include "Bibliography.h"
#include "Medium.h"
#include "Book.h"
#include "Article.h"
int main()
{
Bibliography p(1);
Medium m1("PN","I","Pasol nah",2017);
p.insert(m1);
cout << p;
return 0;
}
Bibliography.h
#ifndef BIBLIOGRAPHY_H_
#define BIBLIOGRAPHY_H_
#include "Medium.h"
#include "Article.h"
#include "Book.h"
#include <iostream>
#include <functional>
#include <vector>
class Bibliography
{
private:
int m_Size;
std::vector<std::reference_wrapper<Medium>> v;
int index;
public:
Bibliography(int size);
void insert(Medium m);
friend std::ostream& operator<<(std::ostream& out, const Bibliography &b1);
};
#endif
Bibliography.cc
#include "Bibliography.h"
Bibliography::Bibliography(int size)
{
std::cout << "Bibliography created n";
m_Size = size;
v.resize(m_Size);
index = 0;
}
void Bibliography::insert(Medium m)
{
v.push_back(m);
}
std::ostream& operator<<(std::ostream& out, const Bibliography &b1)
{
for (Medium &Medium : b1.v)
{
out << Medium.toString() << std::endl;
}
return out;
}
c++ stdvector reference-wrapper
edited Nov 25 '18 at 15:03
vallismortis
3,495104063
asked Dec 16 '17 at 19:16
Gicu MironicaGicu Mironica
61
add a comment |
-2
Book and Article are derived classes from Medium.
Why am I getting this error when trying to insert Medium / Book / Article in the bibliography?
error: no matching function for call to '**std::reference_wrapper<Medium>::reference_wrapper()**
main.cc
#include <iostream>
using namespace std;
#include "Bibliography.h"
#include "Medium.h"
#include "Book.h"
#include "Article.h"
int main()
{
Bibliography p(1);
Medium m1("PN","I","Pasol nah",2017);
p.insert(m1);
cout << p;
return 0;
}
Bibliography.h
#ifndef BIBLIOGRAPHY_H_
#define BIBLIOGRAPHY_H_
#include "Medium.h"
#include "Article.h"
#include "Book.h"
#include <iostream>
#include <functional>
#include <vector>
class Bibliography
{
private:
int m_Size;
std::vector<std::reference_wrapper<Medium>> v;
int index;
public:
Bibliography(int size);
void insert(Medium m);
friend std::ostream& operator<<(std::ostream& out, const Bibliography &b1);
};
#endif
Bibliography.cc
#include "Bibliography.h"
Bibliography::Bibliography(int size)
{
std::cout << "Bibliography created n";
m_Size = size;
v.resize(m_Size);
index = 0;
}
void Bibliography::insert(Medium m)
{
v.push_back(m);
}
std::ostream& operator<<(std::ostream& out, const Bibliography &b1)
{
for (Medium &Medium : b1.v)
{
out << Medium.toString() << std::endl;
}
return out;
}
c++ stdvector reference-wrapper
edited Nov 25 '18 at 15:03
vallismortis
3,495104063
asked Dec 16 '17 at 19:16
Gicu MironicaGicu Mironica
61
add a comment |
-2
-2
-2
0
Book and Article are derived classes from Medium.
Why am I getting this error when trying to insert Medium / Book / Article in the bibliography?
error: no matching function for call to '**std::reference_wrapper<Medium>::reference_wrapper()**
main.cc
#include <iostream>
using namespace std;
#include "Bibliography.h"
#include "Medium.h"
#include "Book.h"
#include "Article.h"
int main()
{
Bibliography p(1);
Medium m1("PN","I","Pasol nah",2017);
p.insert(m1);
cout << p;
return 0;
}
Bibliography.h
#ifndef BIBLIOGRAPHY_H_
#define BIBLIOGRAPHY_H_
#include "Medium.h"
#include "Article.h"
#include "Book.h"
#include <iostream>
#include <functional>
#include <vector>
class Bibliography
{
private:
int m_Size;
std::vector<std::reference_wrapper<Medium>> v;
int index;
public:
Bibliography(int size);
void insert(Medium m);
friend std::ostream& operator<<(std::ostream& out, const Bibliography &b1);
};
#endif
Bibliography.cc
#include "Bibliography.h"
Bibliography::Bibliography(int size)
{
std::cout << "Bibliography created n";
m_Size = size;
v.resize(m_Size);
index = 0;
}
void Bibliography::insert(Medium m)
{
v.push_back(m);
}
std::ostream& operator<<(std::ostream& out, const Bibliography &b1)
{
for (Medium &Medium : b1.v)
{
out << Medium.toString() << std::endl;
}
return out;
}
c++ stdvector reference-wrapper
edited Nov 25 '18 at 15:03
vallismortis
3,495104063
asked Dec 16 '17 at 19:16
Gicu MironicaGicu Mironica
61
Book and Article are derived classes from Medium.
Why am I getting this error when trying to insert Medium / Book / Article in the bibliography?
error: no matching function for call to '**std::reference_wrapper<Medium>::reference_wrapper()**
main.cc
#include <iostream>
using namespace std;
#include "Bibliography.h"
#include "Medium.h"
#include "Book.h"
#include "Article.h"
int main()
{
Bibliography p(1);
Medium m1("PN","I","Pasol nah",2017);
p.insert(m1);
cout << p;
return 0;
}
Bibliography.h
#ifndef BIBLIOGRAPHY_H_
#define BIBLIOGRAPHY_H_
#include "Medium.h"
#include "Article.h"
#include "Book.h"
#include <iostream>
#include <functional>
#include <vector>
class Bibliography
{
private:
int m_Size;
std::vector<std::reference_wrapper<Medium>> v;
int index;
public:
Bibliography(int size);
void insert(Medium m);
friend std::ostream& operator<<(std::ostream& out, const Bibliography &b1);
};
#endif
Bibliography.cc
#include "Bibliography.h"
Bibliography::Bibliography(int size)
{
std::cout << "Bibliography created n";
m_Size = size;
v.resize(m_Size);
index = 0;
}
void Bibliography::insert(Medium m)
{
v.push_back(m);
}
std::ostream& operator<<(std::ostream& out, const Bibliography &b1)
{
for (Medium &Medium : b1.v)
{
out << Medium.toString() << std::endl;
}
return out;
}
c++ stdvector reference-wrapper
c++ stdvector reference-wrapper
edited Nov 25 '18 at 15:03
vallismortis
3,495104063
asked Dec 16 '17 at 19:16
Gicu MironicaGicu Mironica
61
edited Nov 25 '18 at 15:03
vallismortis
3,495104063
asked Dec 16 '17 at 19:16
Gicu MironicaGicu Mironica
61
edited Nov 25 '18 at 15:03
vallismortis
3,495104063
edited Nov 25 '18 at 15:03
vallismortis
3,495104063
edited Nov 25 '18 at 15:03
vallismortis
3,495104063
3,495104063
asked Dec 16 '17 at 19:16
Gicu MironicaGicu Mironica
61
asked Dec 16 '17 at 19:16
Gicu MironicaGicu Mironica
61
asked Dec 16 '17 at 19:16
Gicu MironicaGicu Mironica
61
61
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
You should not use reference_wrapper in vector, because vector can keep objects which have default constructor, reference_wrapper doesn't have it, look at these constructors of reference_wrapper:
initialization (1)
reference_wrapper (type& ref) noexcept;
reference_wrapper (type&&) = delete;
copy (2)
reference_wrapper (const reference_wrapper& x) noexcept;
In this line
v.resize(m_Size);
you want to create m_Size reference_wrapperobjects, but default constructor for reference_wrapper doesn't exist, and code cannot be compiled.
You can use reference_wrapper with vector but you get compilation error
when method of vector is called which needs default constructor to be defined.
answered Dec 16 '17 at 19:39
rafix07rafix07
7,0231714
Is this really true? The C++ Reference specifically uses a vector as the example usage of areference_wrapper.
– vallismortis
Nov 25 '18 at 14:23
1
In the example you posted there is a list with 10 elements.list<int> l(10);vector keepsreference_wrapper<int>, when this vector is createdv(l.begin(),l.end())constructor ofreference_wrapperis called which takes Lvalues as parameter, storing pointer to these Lvalues, so in this case vector+reference_wrapper works. Butresizeon vector cannot be called becauseresizecalls default ctor forreference_wrapper.reference_wrapperneeds to store pointer to some object (reference needs to be initialized). Therefore default ctor for reference_wrapper doesn't exist.
– rafix07
Nov 25 '18 at 14:43
Much appreciated. The C++ Reference would be more helpful if it included examples like this.
– vallismortis
Nov 25 '18 at 15:00
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
You should not use reference_wrapper in vector, because vector can keep objects which have default constructor, reference_wrapper doesn't have it, look at these constructors of reference_wrapper:
initialization (1)
reference_wrapper (type& ref) noexcept;
reference_wrapper (type&&) = delete;
copy (2)
reference_wrapper (const reference_wrapper& x) noexcept;
In this line
v.resize(m_Size);
you want to create m_Size reference_wrapperobjects, but default constructor for reference_wrapper doesn't exist, and code cannot be compiled.
You can use reference_wrapper with vector but you get compilation error
when method of vector is called which needs default constructor to be defined.
answered Dec 16 '17 at 19:39
rafix07rafix07
7,0231714
Is this really true? The C++ Reference specifically uses a vector as the example usage of areference_wrapper.
– vallismortis
Nov 25 '18 at 14:23
1
In the example you posted there is a list with 10 elements.list<int> l(10);vector keepsreference_wrapper<int>, when this vector is createdv(l.begin(),l.end())constructor ofreference_wrapperis called which takes Lvalues as parameter, storing pointer to these Lvalues, so in this case vector+reference_wrapper works. Butresizeon vector cannot be called becauseresizecalls default ctor forreference_wrapper.reference_wrapperneeds to store pointer to some object (reference needs to be initialized). Therefore default ctor for reference_wrapper doesn't exist.
– rafix07
Nov 25 '18 at 14:43
Much appreciated. The C++ Reference would be more helpful if it included examples like this.
– vallismortis
Nov 25 '18 at 15:00
add a comment |
1
You should not use reference_wrapper in vector, because vector can keep objects which have default constructor, reference_wrapper doesn't have it, look at these constructors of reference_wrapper:
initialization (1)
reference_wrapper (type& ref) noexcept;
reference_wrapper (type&&) = delete;
copy (2)
reference_wrapper (const reference_wrapper& x) noexcept;
In this line
v.resize(m_Size);
you want to create m_Size reference_wrapperobjects, but default constructor for reference_wrapper doesn't exist, and code cannot be compiled.
You can use reference_wrapper with vector but you get compilation error
when method of vector is called which needs default constructor to be defined.
answered Dec 16 '17 at 19:39
rafix07rafix07
7,0231714
Is this really true? The C++ Reference specifically uses a vector as the example usage of areference_wrapper.
– vallismortis
Nov 25 '18 at 14:23
1
In the example you posted there is a list with 10 elements.list<int> l(10);vector keepsreference_wrapper<int>, when this vector is createdv(l.begin(),l.end())constructor ofreference_wrapperis called which takes Lvalues as parameter, storing pointer to these Lvalues, so in this case vector+reference_wrapper works. Butresizeon vector cannot be called becauseresizecalls default ctor forreference_wrapper.reference_wrapperneeds to store pointer to some object (reference needs to be initialized). Therefore default ctor for reference_wrapper doesn't exist.
– rafix07
Nov 25 '18 at 14:43
Much appreciated. The C++ Reference would be more helpful if it included examples like this.
– vallismortis
Nov 25 '18 at 15:00
add a comment |
1
1
1
You should not use reference_wrapper in vector, because vector can keep objects which have default constructor, reference_wrapper doesn't have it, look at these constructors of reference_wrapper:
initialization (1)
reference_wrapper (type& ref) noexcept;
reference_wrapper (type&&) = delete;
copy (2)
reference_wrapper (const reference_wrapper& x) noexcept;
In this line
v.resize(m_Size);
you want to create m_Size reference_wrapperobjects, but default constructor for reference_wrapper doesn't exist, and code cannot be compiled.
You can use reference_wrapper with vector but you get compilation error
when method of vector is called which needs default constructor to be defined.
answered Dec 16 '17 at 19:39
rafix07rafix07
7,0231714
You should not use reference_wrapper in vector, because vector can keep objects which have default constructor, reference_wrapper doesn't have it, look at these constructors of reference_wrapper:
initialization (1)
reference_wrapper (type& ref) noexcept;
reference_wrapper (type&&) = delete;
copy (2)
reference_wrapper (const reference_wrapper& x) noexcept;
In this line
v.resize(m_Size);
you want to create m_Size reference_wrapperobjects, but default constructor for reference_wrapper doesn't exist, and code cannot be compiled.
You can use reference_wrapper with vector but you get compilation error
when method of vector is called which needs default constructor to be defined.
answered Dec 16 '17 at 19:39
rafix07rafix07
7,0231714
edited Dec 16 '17 at 20:43
answered Dec 16 '17 at 19:39
rafix07rafix07
7,0231714
answered Dec 16 '17 at 19:39
rafix07rafix07
7,0231714
answered Dec 16 '17 at 19:39
rafix07rafix07
7,0231714
7,0231714
Is this really true? The C++ Reference specifically uses a vector as the example usage of areference_wrapper.
– vallismortis
Nov 25 '18 at 14:23
1
In the example you posted there is a list with 10 elements.list<int> l(10);vector keepsreference_wrapper<int>, when this vector is createdv(l.begin(),l.end())constructor ofreference_wrapperis called which takes Lvalues as parameter, storing pointer to these Lvalues, so in this case vector+reference_wrapper works. Butresizeon vector cannot be called becauseresizecalls default ctor forreference_wrapper.reference_wrapperneeds to store pointer to some object (reference needs to be initialized). Therefore default ctor for reference_wrapper doesn't exist.
– rafix07
Nov 25 '18 at 14:43
Much appreciated. The C++ Reference would be more helpful if it included examples like this.
– vallismortis
Nov 25 '18 at 15:00
add a comment |
Is this really true? The C++ Reference specifically uses a vector as the example usage of areference_wrapper.
– vallismortis
Nov 25 '18 at 14:23
1
In the example you posted there is a list with 10 elements.list<int> l(10);vector keepsreference_wrapper<int>, when this vector is createdv(l.begin(),l.end())constructor ofreference_wrapperis called which takes Lvalues as parameter, storing pointer to these Lvalues, so in this case vector+reference_wrapper works. Butresizeon vector cannot be called becauseresizecalls default ctor forreference_wrapper.reference_wrapperneeds to store pointer to some object (reference needs to be initialized). Therefore default ctor for reference_wrapper doesn't exist.
– rafix07
Nov 25 '18 at 14:43
Much appreciated. The C++ Reference would be more helpful if it included examples like this.
– vallismortis
Nov 25 '18 at 15:00
Is this really true? The C++ Reference specifically uses a vector as the example usage of a
reference_wrapper.– vallismortis
Nov 25 '18 at 14:23
Is this really true? The C++ Reference specifically uses a vector as the example usage of a
reference_wrapper.– vallismortis
Nov 25 '18 at 14:23
1
1
In the example you posted there is a list with 10 elements.
list<int> l(10); vector keeps reference_wrapper<int>, when this vector is created v(l.begin(),l.end()) constructor of reference_wrapper is called which takes Lvalues as parameter, storing pointer to these Lvalues, so in this case vector+reference_wrapper works. But resize on vector cannot be called because resize calls default ctor for reference_wrapper. reference_wrapper needs to store pointer to some object (reference needs to be initialized). Therefore default ctor for reference_wrapper doesn't exist.– rafix07
Nov 25 '18 at 14:43
In the example you posted there is a list with 10 elements.
list<int> l(10); vector keeps reference_wrapper<int>, when this vector is created v(l.begin(),l.end()) constructor of reference_wrapper is called which takes Lvalues as parameter, storing pointer to these Lvalues, so in this case vector+reference_wrapper works. But resize on vector cannot be called because resize calls default ctor for reference_wrapper. reference_wrapper needs to store pointer to some object (reference needs to be initialized). Therefore default ctor for reference_wrapper doesn't exist.– rafix07
Nov 25 '18 at 14:43
Much appreciated. The C++ Reference would be more helpful if it included examples like this.
– vallismortis
Nov 25 '18 at 15:00
Much appreciated. The C++ Reference would be more helpful if it included examples like this.
– vallismortis
Nov 25 '18 at 15:00
add a comment |
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