Overwrite map with map using <algorithm>?

Question

Overwrite map with map using <algorithm>?

I would like to do the following, but it doesn't seem to be possible. I am not an STL expert.

typedef std::map<int,int> CMap;

CMap m1;
m1[0] = 10;
m1[1] = 11;
m1[2] = 12;

CMap m2;
m2[20] = 30;
m2[21] = 31;
m2[22] = 32;

std::copy( m1.begin(), m1.end(), m2.begin() );

Is there a way to do this using an algorithm (C ++ 98)? Can this be done with transform () or replace ()? If so, how?

Thank!

+3

c ++ dictionary stl copy transform

Lorenz Apr 29. '15 at 6:41

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1 answer

Galik · Accepted Answer · 2015-04-29T07:02:01+0000

You can do it:

m2 = m1;

Or even this if you like:

m2.swap(m1);

And this too:

std::copy(m1.begin(), m1.end(), std::inserter(m2, m2.end()));

Overwrite map with map using <algorithm>?

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