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QUESTION
I have an input map inMap whose type is map>.
I am trying to filter this map by means of copy_if like this:
ANSWER
Answered 2021-Jun-09 at 13:34The iterators of a std::map are not suitable for use with copy_if, as that algorithm is simply going to attempt to assign the entire value. However, the iterator of a std::map has a value type of std::pair, which means it is not copy assignable.
However, you can use std::inserter to accomplish what you want
std::copy_if(inMap.begin(), inMap.end(), std::inserter(outMap, outMap.end()), Predicate);
QUESTION
I've two map of Map definitions as shared below, Based on the existence of one key from map1, I need to copy the entry to another map. Below code works as needed but is there any better and simple approach to achieve the same. Your suggestions are appreciated.
...ANSWER
Answered 2020-Nov-19 at 11:09Is it possible that the same setInfo HashSet having more than one map that satisfies this condition?
If yes, your code is only copying the last of those maps as the previous one is getting replaced. So the code should be fixed as follows.
QUESTION
public class PoiSheetUtil{
public Workbook mergeExcelFiles(Workbook book, Map inMap) throws IOException,
InvalidFormatException{
inMap.forEach((k,v)->{
Workbook b = WorkbookFactory.create(v);
//omit copy sheet method
copySheets(book.createSheet(),b.getSheetAt(k));
});
return book;
}
}
ANSWER
Answered 2020-Oct-24 at 08:49The problem here is context; the code that potentially throws the exception sits in the lambda:
QUESTION
I decided using JVMTI to register all exceptions occured in JVM and build Histogram:
ClassName_method_ExceptionName:count
Agent attached like this:
taskset -c 10,12 java -agentpath:./jni-agent.so ${JVM_OPTION} -cp module.jar org.springframework.boot.loader.PropertiesLauncher &
I using this code for JNI agent:
...ANSWER
Answered 2020-Oct-22 at 00:52The crash reason is simple: your code is not thread safe.
Exception callback is invoked on the same thread that throws an exception. If multiple threads throw an exception concurrently, the callback is also invoked concurrently. std::map is not thread safe: concurrent access may cause a crash inside libstdc++.
The reason of slowness is more interesting.
How to analyze performance issues related to interaction between JVM and native? With async-profiler, of course. When profiling application startup, it's convenient to start profiler as an agent.
QUESTION
I have a JS Code which runs well:
...ANSWER
Answered 2020-Sep-28 at 17:12In the Python EE API, use Python named argument syntax instead of dictionaries for arguments.
QUESTION
I need to render a sorted map by a user-defined type. SortedMap[X, Seq[Y]]
Json library should render the map as ordered by the X.name
...ANSWER
Answered 2020-Jul-24 at 07:39So...
- I never meet the word "render" used as "convert to"
- ordering by key original key in SortedSet is lost after mapping because you change the key type so the result is ordered by a new key type (here: String)
- if you want to preserve the order of items in between mapping I would suggest using
ListMap - though in your particular case you can do away with Seq of tuples, as at the end of the day, this is what you need to produce
QUESTION
I am trying to create a simple generic udf for my hive queries.
Here is my hive table
...ANSWER
Answered 2020-Jun-30 at 15:13What you need to return in initialize is the ObjectInspector corresponding to the returning type of the UDF (ListObjectInspector in your case).
When you write
QUESTION
Here is my hive table
...ANSWER
Answered 2020-Jun-29 at 16:48See the citation from the link you've sent:
Note that Hive Arrays are represented as Lists in Hive. So an ARRAY column would be passed in as a List.
So you should have evaluate(Map> inMap) signature instead of evaluate(Map inMap).
QUESTION
I've map of key value pairs with each value being a map of key value pairs.
Something like
...ANSWER
Answered 2019-Aug-23 at 16:03What you want to achieve can be done with this single line of code:
QUESTION
I have implemented a serializer to send data over network. And I have implemented a system that can deserialize primitive data, string, map(string, string), map(string, float), but the error happens with map(string, int) when the deserialized map is used to fetch the value from key. In the debugger I can see that map receive correct value but when I'm trying to get data, I get an error "std::out_of_range at memory location".
Here is my code
...ANSWER
Answered 2019-Jun-30 at 10:20Your void Write(const std::string& inString) function of OutputMemoryStream should not store additional byte of buffer for null terminator because std::string will not contain null terminator but if you use c_str(), a null terminator will be included in the return from this method. Don't get confused with the internal structure of the memory. std::string stores the length of the string in its member variable so there is no need of null terminator. The function should be as shown below.
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