std:map insert question

[Evyn]

Hi all,

I'm starting to fool around with STL and in particular std::map.

How do I iterate through one map and insert every pair in another map?

I have the following so far:

map<double, doublefset1;
map<double, doublefset3;

fset1.insert(pa ir<double, double>(1.0,0.4 ));
// etc etc more values etc etc

ifs1 = fset1.begin();
while(ifs1 != fset1.end())
{
// how to insert is the q!
}
Thanks for your time!
Evyn

[Rolf Magnus]

Evyn wrote:

Hi all,

I'm starting to fool around with STL and in particular std::map.

How do I iterate through one map and insert every pair in another map?

By using std::copy.

I have the following so far:

map<double, doublefset1;
map<double, doublefset3;

fset1.insert(pa ir<double, double>(1.0,0.4 ));

fset1.insert(ma ke_pair(1.0,0.4 ));

// etc etc more values etc etc

ifs1 = fset1.begin();
while(ifs1 != fset1.end())
{
// how to insert is the q!

fset3.insert(*i fs1);
++ifs1;

}

[Kai-Uwe Bux]

Evyn wrote:

Hi all,

I'm starting to fool around with STL and in particular std::map.

How do I iterate through one map and insert every pair in another map?

I have the following so far:

map<double, doublefset1;
map<double, doublefset3;

fset1.insert(pa ir<double, double>(1.0,0.4 ));
// etc etc more values etc etc

ifs1 = fset1.begin();
while(ifs1 != fset1.end())
{
// how to insert is the q!
}

std::copy( fset1.begin(), fset1.end(),
std::inserter( fset2, fset2.begin() ) );
E.g.:

#include <map>
#include <algorithm>
#include <iterator>
#include <iostream>

int main ( void ) {
std::map< int, int a;
std::map< int, int b;
b[2] = 1;
b[4] = 2;
a[3] = 0;
a[5] = 2;

std::copy( a.begin(), a.end(),
std::inserter( b, b.begin() ) );

for ( std::map< int, int >::const_iterat or iter = b.begin();
iter != b.end(); ++iter ) {
std::cout << iter->first
<< " --"
<< iter->second
<< "\n";
}
}
Best

Kai-Uwe Bux

[Evyn]

Thanks for the help!

On Jan 19, 2:37 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

Evyn wrote:

Hi all,

I'm starting to fool around with STL and in particular std::map.

How do I iterate through one map and insert every pair in another map?

I have the following so far:

map<double, doublefset1;
map<double, doublefset3;

fset1.insert(pa ir<double, double>(1.0,0.4 ));
// etc etc more values etc etc

ifs1 = fset1.begin();
while(ifs1 != fset1.end())
{
// how to insert is the q!
}std::copy( fset1.begin(), fset1.end(),

std::inserter( fset2, fset2.begin() ) );

E.g.:

#include <map>
#include <algorithm>
#include <iterator>
#include <iostream>

int main ( void ) {
std::map< int, int a;
std::map< int, int b;
b[2] = 1;
b[4] = 2;
a[3] = 0;
a[5] = 2;

std::copy( a.begin(), a.end(),
std::inserter( b, b.begin() ) );

for ( std::map< int, int >::const_iterat or iter = b.begin();
iter != b.end(); ++iter ) {
std::cout << iter->first
<< " --"
<< iter->second
<< "\n";
}

}Best

Kai-Uwe Bux- Hide quoted text -- Show quoted text -

[dasjotre]

Evyn wrote:

Hi all,

I'm starting to fool around with STL and in particular std::map.

How do I iterate through one map and insert every pair in another map?

I have the following so far:

map<double, doublefset1;
map<double, doublefset3;

fset1.insert(fs et3.begin(), fset3.end());