multimap

问题 I'm still seeking an ideal solution to this question. To summarize, I am modeling a power subsystem in Java and I need a Directed-Acyclic-Graph (DAG)-type container for my data. I found exactly what I need in C++'s Standard Template Library (STL). It is the multiset, which supports storing multiple data values for the same key. I can clearly see how storing power nodes and keys, and their upstream/downstream connections as values, could be pulled off with this data structure. My customer has

问题 I'm debugging my code and at one point I have a multimap which contains pairs of a long and a Note object created like this: void Track::addNote(Note &note) { long key = note.measureNumber * 1000000 + note.startTime; this->noteList.insert(make_pair(key, note)); } I wanted to look if these values are actually inserted in the multi map so I placed a breakpoint and this is what the multimap looks like (in Xcode): It seems like I can infinitely open the elements (my actual multimap is the first

问题 I am trying to create a multimap indexed on a C-style string, as shown in the following code segment: #include <cstring> #include <map> #include <iostream> using namespace std; int main(void) { int i, j; int (*fn_pt)(const char *, const char *) = strcmp; multimap<char *, char *, int (*)(const char *, const char *)>a(fn_pt); for (i = 0; i < 2; i++) { char key[2]; sprintf(key, "%d", i); for (j = 0; j< 5; j++) { char value[2]; sprintf(value, "%d", j); a.insert(pair<char *, char *>(key, value));

问题 Is it possible for a multimap to contain within it pairs? IE, rather then being defined as multimap<char,int> for instance, it would be defined as multimap<pair, pair >? How would this multimap then be sorted? Also, how would one access the individual contents of each pair? 回答1: Is it possible for a multimap to contain within it pairs? Yes its possible. How would this multimap then be sorted? By the key/first pair (ie, first by the first element of the first pair, then by the second element

问题 I created a program that finds the median of a list of numbers. The list of numbers is dynamic in that numbers can be removed and inserted (duplicate numbers can be entered) and during this time, the new median is re-evaluated and printed out. I created this program using a multimap because 1) the benefit of it being already being sorted, 2) easy insertion, deletion, searching (since multimap implements binary search) 3) duplicate entries are allowed. The constraints for the number of entries

问题 i m trying to convert json into map as key value pair i have a method JsonSlurper() which give me the key value pair but my query is i have a json as bellow. {"Result":"null", "gbet":{"Qpet":[ {"msg":"MSG","over":"N","repair":[{"notification":null,"sce":"1","repair1":"CA","repairDes":null,"ran":1}, {"rep":"dvr"}], {"msgger":"MSGwe","overw":"Ner"}] } how to get all the things in a single map with each key value pair i m doing like this def slurper = new JsonSlurper().parseText(str) log.info(

问题 I want a limited size map with some duplicated keys. When size is reached I want delete the oldest entry. for example, this data set: MAX_SIZE=5; map.put(100,"OLDEST"); map.put(101,"XXXX"); map.put(101,"YYYY"); map.put(102,"ZZZZ"); map.put(103,"GGGG"); Then I want to insert a new entry in the map myLength = map.size() if(myLength>=MAX_SIZE){ map.remove(the OLDEST) } map.put(105,"NEW") I was thinking in guava multimap, but how delete the oldest entry in multimap? They KEY is a Long, maybe I

问题 I am new to c++ coding and have a need to swap/replace the old multimap object with the newly built multimap object, as this object will be cache I would like to replace the existing object only after building the new object and just replace the object itself. This will be used in a multithreaded environment, so using the atomic load. As described in this thread Want an efficient way to swap two pointers in C++. I wrote this code #include<iostream> #include<map> #include<atomic> #include

问题 I wrote a program that have to read a big file with operator>> , count some stuff and insert datas (string and int) in a multimap. The problem is that the program crashes and it seems to be a memory problem (it works well with small files). I think that it reaches the memory allocation limit of Windows. What I tried : I made a 32-bit and an 64-bit versions. As you know, Windows has a memory allocation limit that is not the same for 32bits and 64bits builds. With both it crashes. I looked the

问题 This is a composed concurrent list multimap implementation. A lower-level implementation would be better, but more complex. Ignoring the O(n) removal in the sublist, is this the correct way to compose a ConcurrentMap and CopyOnWriteArrayList into a functional ConcurrentMultimap? Are there any unresolved data races? private final ConcurrentMap<K, Collection<V>> map = ...; // inconsequential public boolean put(K key, V value) { Collection<V> list = map.get(key); if(list != null) { list.add