Linked Questions

I'm using Xcode with C++ 11 for a std::map. Some elements in my map have a flag that says they need to be removed. I want to iterate through the map, erasing the flagged elements in O(n) time. The ...

I often use this syntax to loop through a std::map: for( const auto& my_pair: my_map ) Can I call my_map.erase( my_pair.first ); safely?

I use this code to remove elements from map container that equal to some int. for(auto x:m){ if((x.second)==element)m.erase(x.first); } As result Segmentation fault. I also tried this: for(map<...

I'm trying to delete all entries in a map where value == 50 for any key. This code is working fine for me. while (itr != mymap.end()) { if ((*itr).second == 50) mymap.erase(itr++); ...

I am trying to determine the maximum number of items I can remove from a list using std list to get the minimum size. However, it keeps ending up in bad memory access. This is my recursive function: ...

I am using a small library to have a database connection pool. However, when I run the provided example, at the point where it calls DestroyPool I get a map is not increment-able assertion fail. ...

I have defined the following: typedef std::set<std::string> entry; typedef std::map<entry, size_t> freq_map; In this way, I can read in lines from a text file of this form and keep track ...

I have a std::map<int, std::string> and my aim is to remove a key-value pair based on a certain condition. For simplicity, let say, it looks like this: int main(int argc, char const *argv[]) { ...

for(auto it = prefixSet.begin();it!=prefixSet.end();it++) { string str = *it; if(prefixSet.count(str) > 1) { cout << prefixSet.count(str) << " " &...

I am trying to do something like this: for ( std::list< Cursor::Enum >::reverse_iterator i = m_CursorStack.rbegin(); i != m_CursorStack.rend(); ++i ) { if ( *i == pCursor ) { ...

I was trying to erase a range of elements from map based on particular condition. How do I do it using STL algorithms? Initially I thought of using remove_if but it is not possible as remove_if does ...

In the following code I loop through a map and test if an element needs to be erased. Is it safe to erase the element and keep iterating or do I need to collect the keys in another container and do a ...

Allegedly you cannot just erase/remove an element in a container while iterating as iterator becomes invalid. What are the (safe) ways to remove the elements that meet a certain condition? please only ...

I have roughly the following code. Could this be made nicer or more efficient? Perhaps using std::remove_if? Can you remove items from the map while traversing it? Can we avoid using the temporary map?...

I'm reading someone else's code and they separately increment their for loop counter inside the loop, as well as including the usual afterthought. For example: for( int y = 4; y < 12; y++ ) { /...