I'd like to create a std::map that contains a std::vector of iterators into itself, to implement a simple adjacency list-based graph structure. However, the type declaration has me stumped: it would seem you need the entire map type definition to get the iterator type of said map, like so: map< int, Something >::iterator MyMap_it; /...
I have the following mostly ok code: my $results = { data => [ map { my $f = $_->TO_JSON; $f->{display_field} = $_->display_field($q); $f; } $rs->all ]}; Only I'd rather it were more like the following: my $results = { data => [ map { %{$_->TO_JSON}, display_field => $_->display_field($q), },...
Hi, I'm using the STL map data structure, and at the moment my code first invokes find(): if the key was not previously in the map, it calls insert() it, otherwise it does nothing. map<Foo*, string>::iterator it; it = my_map.find(foo_obj); // 1st lookup if(it == my_map.end()){ my_map[foo_obj] = "some value"; // 2nd lookup }else{ ...
I have a question regarding struts. I have a HashMap which has nearly 50 entries. Now I have to define this map inside an action class, say TestAction. As you know, this action class extends the Action class. Now my doubt is fundamental: Should I load the map as static? What are the advantages of loading this Map static? If I am g...
I want to extract information such (longitude,latitude,location name) from garmin maps and use the database of this info in my java web application. but i dont know how to extract a region information such as a city from a garmin map as text or binary. If anyone know about it help me please. ...
When I have a class with a Map member, I don't want to draw a separate class/interface object to represent the Map itself, but I'd prefer to treat the map as if it was a native type, rather than a complex object. Consider the following example public class IndexManagerImpl implements IndexManager { /* ... */ private static Map...
I have the following code private Map<KEY, Object> values = new HashMap<KEY, Object>(); public void set(KEY key, Object value) { values.put(key, value); } private Object getObj(KEY key) { return values.get(key) == null ? key.getDefaultValue() : values.get(key); } public List<E> getList(KEY key) { return (List<E>) getObj(key); } ...
I have some US demographic and firmographic data. I would like to plot zipcode areas in a state or a smaller region (e.g. city). Each area would be annotated by color and/or text specific to that area. The output would be similar to http://maps.huge.info/ but a) with annotated text; b) pdf output; c) scriptable in R or Python. Is there ...
I have a class with Maps from Ks to Set<V>s, for several different Vs. I'd like to use a generic factory ala: protected static <T> Set<T> SetFactory(int size) { return new HashSet<T>(size); } to do something like for (K key : keySet) map.put(key, SetFactory()); and have the generic part work (I get a compile error, type misma...
Hello, i'm trying to start a project that will present a map and drop some pins for the museums in my town. I played with map kit and route-me from Cloudmade so i'm not a stranger to them. I want to try something like OffMaps does, to use maps offline but i want to provide the tiles from the start. I downloaded the tiles from OpenStree...
The code I wrote is as below : #!/usr/bin/perl my @input = ( "a.txt" , "b.txt" , "c.txt" ) ; my @output = map { $_ =~ s/\..*$// } @input ; print @output ; My intention is to let the file name without the extension stored in the array @output. but instead it stores the value returned by s/// rather than the changed file name in @ou...
I'm using Richfaces JSF and I want to iterate over an Map<Object,Object>. I see many examples on Sun forums and other sites but in my case it doesn't work. Here is my XHTML code: <c:forEach items="#{order.customOptions}" var="option"> <h:outputText value="this text does not print" /> <h:outputText value="#{option.value.name}" />...
Where can you get terrain data? What resolution data can you get for free? What resolution data can you get when you buy the data? How much is that data? I found this site that has free terrain data. The resolution is 30m x 30m. Is that the best that can be found for free? ...
Hi! How do i map this function with JNA: Delphi code: function getData(InData1: PChar; InData2: PChar; Data: TArray16; var OutData1: PChar; var OutData2: PChar): integer; stdcall; with: TArray16 = array[0..15] of char; The int value that is returned can be 0 fo...
Newbie question here. I'd like to create a map with an int and my own custom class. Is there a way to do this? map myMap; If not, how do I go about accomplishing this? Basically, I want an id(or preferably an enum) to point to my own custom class. In most other languages, this would be a simple hash. Thanks. ...
I have an integral position-based algorithm. (That is, the output of the algorithm is based on a curvilinear position, and each result is influenced by the values of the previous results). To avoid recalculating each time, I would like to pre-calculate at a given sample rate, and subsequently perform a lookup and either return a pre-cal...
I am in the midst of learning Ruby and thought I was clever with the following piece of code: [@start,@end].map!{ |time| time += operation == :add ? amount : -(amount) } where @start, @end are two module level variables, operation can be one of :add or :sub, and amount is an float amount to adjust both @start and @end by. Granted it ...
I can declare an array of maps using generics to specify the map type: private Map<String, Integer>[] myMaps; However, I can't figure out how to instantiate it properly: myMaps = new HashMap<String, Integer>[count]; // gives "generic array creation" error myMaps = new HashMap[count]; // gives an "unchecked or unsafe operation" warnin...
Hi I am using Haskell to solve problem 99 in euler project, where I must find the maximum result from a list of base exponent pairs. I came up with this: prob99 = maximum $ map ((fst)^(snd)) numbers Where the numbers are in the form: numbers = [[519432,525806],[632382,518061],[78864,613712].. Why doesn't this work? Do I need to c...
Is there any way to rename the first and second accessor functions of a map iterator. I understand they have these names because of the underlying pair which represents the key and value, but I'd like the iterators to be a little more readable. I think this might be possible using an iterator adaptor, but I'm not sure how to implement ...