define a method with a vector of templates as an argument
Multi tool use
-4
I have a method in my C++11 code that accepts a template as an argument
template<typename type> uint64_t insert(type item) {
//code
return id;
}
and I want to create a similar in order to insert many items. My attempt was to pass these items as a vector. However the compilation failed with error "error: template argument 1 is invalid"
template<typename type> std::vector<uint64_t> insert_many(std::vector<type insta> items) {
std::vector<uint64_t> v;
//v.push_back(...)
//code
return v;
}
What is wrong with the above method signature?
c++ c++11
asked Nov 19 '18 at 11:54
Captain NemoCaptain Nemo
246
|
show 3 more comments
-4
I have a method in my C++11 code that accepts a template as an argument
template<typename type> uint64_t insert(type item) {
//code
return id;
}
and I want to create a similar in order to insert many items. My attempt was to pass these items as a vector. However the compilation failed with error "error: template argument 1 is invalid"
template<typename type> std::vector<uint64_t> insert_many(std::vector<type insta> items) {
std::vector<uint64_t> v;
//v.push_back(...)
//code
return v;
}
What is wrong with the above method signature?
c++ c++11
asked Nov 19 '18 at 11:54
Captain NemoCaptain Nemo
246
2
What istype insta?
– Rhathin
Nov 19 '18 at 11:58
insert_many(const std::vector<type>& items), don't copy your vector.
– Matthieu Brucher
Nov 19 '18 at 11:58
2
std::vector<type insta>is a syntax error, did you meanstd::vector<type>?
– M.M
Nov 19 '18 at 11:59
2
There is no such thing as a vector of templates. There are function templates and class templates in C++, and neither can be an element of a vector.
– n.m.
Nov 19 '18 at 12:01
1
Your code compiles correctly since the edit, except thatidis not defined. Please post a MCVE if you are still having trouble
– M.M
Nov 19 '18 at 12:10
|
show 3 more comments
-4
-4
-4
I have a method in my C++11 code that accepts a template as an argument
template<typename type> uint64_t insert(type item) {
//code
return id;
}
and I want to create a similar in order to insert many items. My attempt was to pass these items as a vector. However the compilation failed with error "error: template argument 1 is invalid"
template<typename type> std::vector<uint64_t> insert_many(std::vector<type insta> items) {
std::vector<uint64_t> v;
//v.push_back(...)
//code
return v;
}
What is wrong with the above method signature?
c++ c++11
asked Nov 19 '18 at 11:54
Captain NemoCaptain Nemo
246
I have a method in my C++11 code that accepts a template as an argument
template<typename type> uint64_t insert(type item) {
//code
return id;
}
and I want to create a similar in order to insert many items. My attempt was to pass these items as a vector. However the compilation failed with error "error: template argument 1 is invalid"
template<typename type> std::vector<uint64_t> insert_many(std::vector<type insta> items) {
std::vector<uint64_t> v;
//v.push_back(...)
//code
return v;
}
What is wrong with the above method signature?
c++ c++11
c++ c++11
asked Nov 19 '18 at 11:54
Captain NemoCaptain Nemo
246
asked Nov 19 '18 at 11:54
Captain NemoCaptain Nemo
246
edited Nov 19 '18 at 12:13
Captain Nemo
asked Nov 19 '18 at 11:54
Captain NemoCaptain Nemo
246
asked Nov 19 '18 at 11:54
Captain NemoCaptain Nemo
246
asked Nov 19 '18 at 11:54
Captain NemoCaptain Nemo
246
246
2
What istype insta?
– Rhathin
Nov 19 '18 at 11:58
insert_many(const std::vector<type>& items), don't copy your vector.
– Matthieu Brucher
Nov 19 '18 at 11:58
2
std::vector<type insta>is a syntax error, did you meanstd::vector<type>?
– M.M
Nov 19 '18 at 11:59
2
There is no such thing as a vector of templates. There are function templates and class templates in C++, and neither can be an element of a vector.
– n.m.
Nov 19 '18 at 12:01
1
Your code compiles correctly since the edit, except thatidis not defined. Please post a MCVE if you are still having trouble
– M.M
Nov 19 '18 at 12:10
|
show 3 more comments
2
What istype insta?
– Rhathin
Nov 19 '18 at 11:58
insert_many(const std::vector<type>& items), don't copy your vector.
– Matthieu Brucher
Nov 19 '18 at 11:58
2
std::vector<type insta>is a syntax error, did you meanstd::vector<type>?
– M.M
Nov 19 '18 at 11:59
2
There is no such thing as a vector of templates. There are function templates and class templates in C++, and neither can be an element of a vector.
– n.m.
Nov 19 '18 at 12:01
1
Your code compiles correctly since the edit, except thatidis not defined. Please post a MCVE if you are still having trouble
– M.M
Nov 19 '18 at 12:10
2
2
What is
type insta ?– Rhathin
Nov 19 '18 at 11:58
What is
type insta ?– Rhathin
Nov 19 '18 at 11:58
insert_many(const std::vector<type>& items), don't copy your vector.– Matthieu Brucher
Nov 19 '18 at 11:58
insert_many(const std::vector<type>& items), don't copy your vector.– Matthieu Brucher
Nov 19 '18 at 11:58
2
2
std::vector<type insta> is a syntax error, did you mean std::vector<type> ?– M.M
Nov 19 '18 at 11:59
std::vector<type insta> is a syntax error, did you mean std::vector<type> ?– M.M
Nov 19 '18 at 11:59
2
2
There is no such thing as a vector of templates. There are function templates and class templates in C++, and neither can be an element of a vector.
– n.m.
Nov 19 '18 at 12:01
There is no such thing as a vector of templates. There are function templates and class templates in C++, and neither can be an element of a vector.
– n.m.
Nov 19 '18 at 12:01
1
1
Your code compiles correctly since the edit, except that
id is not defined. Please post a MCVE if you are still having trouble– M.M
Nov 19 '18 at 12:10
Your code compiles correctly since the edit, except that
id is not defined. Please post a MCVE if you are still having trouble– M.M
Nov 19 '18 at 12:10
|
show 3 more comments
1 Answer
1
active
oldest
votes
2
Assuming that type is the type of the objects you store in your vector.
#include <iostream>
#include <vector>
template<typename type>
typename std::vector<type>::iterator insert(std::vector<type>& v, const std::vector<type>& add) {
return v.insert(v.end(), add.begin(), add.end());
}
int main() {
std::vector<int> a{0,1,2,3,4};
std::vector<int> b{5,6};
insert(a, b);
for(const auto val : a) {
std::cout << val << "n";
}
}
Output
0
1
2
3
4
5
6
answered Nov 19 '18 at 12:09
Ted LyngmoTed Lyngmo
2,1961317
add a comment |
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1 Answer
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1 Answer
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2
Assuming that type is the type of the objects you store in your vector.
#include <iostream>
#include <vector>
template<typename type>
typename std::vector<type>::iterator insert(std::vector<type>& v, const std::vector<type>& add) {
return v.insert(v.end(), add.begin(), add.end());
}
int main() {
std::vector<int> a{0,1,2,3,4};
std::vector<int> b{5,6};
insert(a, b);
for(const auto val : a) {
std::cout << val << "n";
}
}
Output
0
1
2
3
4
5
6
answered Nov 19 '18 at 12:09
Ted LyngmoTed Lyngmo
2,1961317
add a comment |
2
Assuming that type is the type of the objects you store in your vector.
#include <iostream>
#include <vector>
template<typename type>
typename std::vector<type>::iterator insert(std::vector<type>& v, const std::vector<type>& add) {
return v.insert(v.end(), add.begin(), add.end());
}
int main() {
std::vector<int> a{0,1,2,3,4};
std::vector<int> b{5,6};
insert(a, b);
for(const auto val : a) {
std::cout << val << "n";
}
}
Output
0
1
2
3
4
5
6
answered Nov 19 '18 at 12:09
Ted LyngmoTed Lyngmo
2,1961317
add a comment |
2
2
2
Assuming that type is the type of the objects you store in your vector.
#include <iostream>
#include <vector>
template<typename type>
typename std::vector<type>::iterator insert(std::vector<type>& v, const std::vector<type>& add) {
return v.insert(v.end(), add.begin(), add.end());
}
int main() {
std::vector<int> a{0,1,2,3,4};
std::vector<int> b{5,6};
insert(a, b);
for(const auto val : a) {
std::cout << val << "n";
}
}
Output
0
1
2
3
4
5
6
answered Nov 19 '18 at 12:09
Ted LyngmoTed Lyngmo
2,1961317
Assuming that type is the type of the objects you store in your vector.
#include <iostream>
#include <vector>
template<typename type>
typename std::vector<type>::iterator insert(std::vector<type>& v, const std::vector<type>& add) {
return v.insert(v.end(), add.begin(), add.end());
}
int main() {
std::vector<int> a{0,1,2,3,4};
std::vector<int> b{5,6};
insert(a, b);
for(const auto val : a) {
std::cout << val << "n";
}
}
Output
0
1
2
3
4
5
6
answered Nov 19 '18 at 12:09
Ted LyngmoTed Lyngmo
2,1961317
answered Nov 19 '18 at 12:09
Ted LyngmoTed Lyngmo
2,1961317
answered Nov 19 '18 at 12:09
Ted LyngmoTed Lyngmo
2,1961317
answered Nov 19 '18 at 12:09
Ted LyngmoTed Lyngmo
2,1961317
2,1961317
add a comment |
add a comment |
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2
What is
type insta?– Rhathin
Nov 19 '18 at 11:58
insert_many(const std::vector<type>& items), don't copy your vector.– Matthieu Brucher
Nov 19 '18 at 11:58
2
std::vector<type insta>is a syntax error, did you meanstd::vector<type>?– M.M
Nov 19 '18 at 11:59
2
There is no such thing as a vector of templates. There are function templates and class templates in C++, and neither can be an element of a vector.
– n.m.
Nov 19 '18 at 12:01
1
Your code compiles correctly since the edit, except that
idis not defined. Please post a MCVE if you are still having trouble– M.M
Nov 19 '18 at 12:10