要替换二维向量中的元素？

问题描述

嗨
我需要帮助来捕捉二维矢量的特定第二元素并用一个新字符串替换它。

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

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

我尝试过迭代器，但是迭代器是矢量的副本，而不是矢量本身。



我的尝试：

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

What I have tried:

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");
 }

}

推荐答案

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

或者， C ++ 11

or, with C++11

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

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";
}

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