To replace an elemnt in the 2 dimensional vector?

Question

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Hi I need help to catch a specific second elemnt of a 2d vector and replace it with a new string.

C++

vector<pair<int,string>> 2dvector;

I have tried by iterator but iterator is a copy of vector and not the vector itself.

What I have tried:

C#

for (vector<pair<int,string>>::iterator it = 2dvector.begin() ; it != 2dvector.end(); ++it)
{
 if (it->second.find("OldString") != std::string::npos)
 {
	it->second.insert("NEWSTRING");
 }

}

Posted 23-Dec-16 2:22am

merh

Updated 23-Dec-16 3:08am

Leo Chapiro

v2

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CPallini · Accepted Answer · 2016-12-23T02:50:00

In order to replace a string, I would rather use

C++

for ( vector< pair< int, string > >::iterator it = v.begin(); it != v.end(); ++it)
{
  if ( it->second == "OldString")
    it->second = "NEWSTRING";
}

or, with C++11

C++

for ( auto & x : v)
{
  if ( x.second == "OldString")
    x.second = "NEWSTRING";
}

Leo Chapiro · Accepted Answer · 2016-12-23T03:01:00

You can work without iterator ("oldschool-like" if it is easier for you) like this:

C#

vector<pair<int, string>> myVector(10);
myVector[0] = { 1, "test1" };
myVector[1] = { 2, "test2" };
myVector[2] = { 3, "test3" };

int nSize = myVector.size();

for (int i = 0; i < nSize; i++)
{
	if (myVector[i].second == "test2")
		myVector[i].second = "test22";
}

To replace an elemnt in the 2 dimensional vector?

2 solutions

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