Hello,
Can any one explain why the following code cannot get compiled ??
Thanks.
#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
using namespace std;
int main(int argc, char* argv[])
{
struct A
{
void operator()(int i)
{
cout << i << endl;
}
};
vector<intv(3);
for_each( v.begin(), v.end(), A() );
return 0;
}
c.cpp: In function 'int main(int, char**)':
c.cpp:21: error: no matching function for call to
'for_each(__gnu _cxx::__normal_ iterator<int*, std::vector<int ,
std::allocator< int >, __gnu_cxx::__no rmal_iterator<i nt*,
std::vector<int , std::allocator< int >, main(int, char**)::A)' 3 1766
Nan Li wrote:
Hello,
Can any one explain why the following code cannot get compiled ??
Thanks.
#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
using namespace std;
int main(int argc, char* argv[])
{
struct A
{
void operator()(int i)
{
cout << i << endl;
}
};
vector<intv(3);
for_each( v.begin(), v.end(), A() );
return 0;
}
c.cpp: In function 'int main(int, char**)':
c.cpp:21: error: no matching function for call to
'for_each(__gnu _cxx::__normal_ iterator<int*, std::vector<int ,
std::allocator< int >, __gnu_cxx::__no rmal_iterator<i nt*,
std::vector<int , std::allocator< int >, main(int, char**)::A)'
gcc trying to tell you in its own obscure way that you can't use a local
type as a template argument.
--
Ian Collins.
On Feb 17, 2:55 am, Nan Li <nan.l...@gmail .comwrote:
Hello,
Can any one explain why the following code cannot get compiled ??
Thanks.
#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
using namespace std;
int main(int argc, char* argv[])
{
struct A
{
void operator()(int i)
{
cout << i << endl;
}
};
vector<intv(3);
for_each( v.begin(), v.end(), A() );
return 0;
}
c.cpp: In function 'int main(int, char**)':
c.cpp:21: error: no matching function for call to
'for_each(__gnu _cxx::__normal_ iterator<int*, std::vector<int ,
std::allocator< int >, __gnu_cxx::__no rmal_iterator<i nt*,
std::vector<int , std::allocator< int >, main(int, char**)::A)'
Your operator expects a parameter.
Since you'ld end up using a placeholder...
Why not just use boost::lambda
#include <iostream>
#include <vector>
#include <algorithm>
#include "boost/lambda/lambda.hpp"
int main()
{
using boost::lambda:: _1;
std::vector< int v(3, 9);
std::for_each( v.begin(), v.end(), std::cout << _1 << '\n' );
}
/*
9
9
9
*/ http://www.boost.org/doc/html/lambda.html
In article <33e8504b-bca1-411f-bf19-b619a4846c67
@q70g2000hsb.go oglegroups.com> , na******@gmail. com says...
Hello,
Can any one explain why the following code cannot get compiled ??
Thanks.
#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
using namespace std;
int main(int argc, char* argv[])
{
struct A
{
void operator()(int i)
{
cout << i << endl;
}
};
vector<intv(3);
for_each( v.begin(), v.end(), A() );
return 0;
}
Local types don't have linkage, so they can't be used as template
parameters.
Fortunately, the entire type and for_each that uses it work out to:
std::copy(v.beg in(), v.end(),
std::ostream_it erator<int>(std ::cout, "\n"));
--
Later,
Jerry.
The universe is a figment of its own imagination. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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