lookup

Implementing a QHash-like lookup with multiple keys

由 荒凉一梦 提交于 2019-12-07 11:58:45
问题 I'm trying to find the best way to implement a QHash-like lookup table that uses multiple keys to return one value. I have read that the Boost library has similar functionality, but I would like to avoid this if possible. An example of what I would like to do is as follows (obviously the following pseudo-code is not possible): //First key (int) - Engine cylinders //Second key (int) - Car weight //Value (int) - Top speed MyLookup<int, int, int> m_Lookup m_Lookup.insert(6, 1000, 210); m_Lookup

How ToLookup() with multiple indexes?

由 一个人想着一个人 提交于 2019-12-07 10:14:05
问题 Taking into account the code for C# Console application below, using how should I modify it in order to substitute the line: foreach (Product product in productsByCategory[category]) by the code line foreach (Product product in productsByCategory[category][Id]) ? using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace myQuestion { class Program { static void Main(string[] args) { var products = new List<Product> { new Product { Id = 1, Category =

adding multiple bitmap values for one key in dictionary with C#

由 巧了我就是萌 提交于 2019-12-07 07:00:44
问题 I had a dictionary to store pattern images for OCR purposes. I grabbed these bitmaps from dictionary and compared to ones that I cropped from image, if they matched => grabbed the key (OCR part is done). The problem arises here. One Key should be represented by several different bitmaps (i.e. values). How do you add multiple bitmaps to the dictionary, to represent the same key? that's how I used dictionary: Dictionary<string, Bitmap> lookup = new Dictionary<string, Bitmap>(); lookup.Add("A",

Additional hash lookup using 'exists'?

由 ◇◆丶佛笑我妖孽 提交于 2019-12-07 04:56:32
问题 I sometimes access a hash like this: if(exists $ids{$name}){ $id = $ids{$name}; } Is that good practice? I'm a bit concerned that it contains two lookups where really one should be done. Is there a better way to check the existence and assign the value? 回答1: By checking with exists , you prevent autovivification. See Autovivification : What is it and why do I care?. UPDATE: As trendels points out below, autovivification does not come into play in the example you posted. I am assuming that the

How to do jndi lookup of MQ connection factory defined in Websphere app Server from Spring

由 纵然是瞬间 提交于 2019-12-07 04:45:17
问题 I am trying to connect to a MQ connection factory defined in Websphere app Server 7.0. But I couldnt find a right connectionfactory interface for the MQ to define in Spring. However when I tried to hardcode the connection details in the spring config file, I am able to connect to the Queue Manager. What is the right interface/format to use in Spring beans to load the MQ connection factory defined in Websphere appl server? Working Code <bean id="mqConnectionFactory" class="com.ibm.mq.jms

Spring Boot - JNDI value lookup

由 别等时光非礼了梦想. 提交于 2019-12-06 21:05:52
@SpringBootApplication public class SampleTomcatJndiApplication { public static void main(String[] args) { SpringApplication.run(SampleTomcatJndiApplication.class, args); } @Bean public TomcatEmbeddedServletContainerFactory tomcatFactory() { return new TomcatEmbeddedServletContainerFactory() { @Override protected TomcatEmbeddedServletContainer getTomcatEmbeddedServletContainer( Tomcat tomcat) { tomcat.enableNaming(); return super.getTomcatEmbeddedServletContainer(tomcat); } @Override protected void postProcessContext(Context context) { ContextResource resource = new ContextResource(); resource

Pandas lookup, mapping one column in a dataframe to another in a different dataframe

由 馋奶兔 提交于 2019-12-06 18:30:16
问题 I have two pandas dataframes: df1 and df2. df1 has columns X and Y and weeknum. df2 has columns Z, weeknum, and datetime. I want to basically keep df1 and have an extra column in it that is corresponding datetime for weeknum. I can use merge but there must be a cleaner way, without having to drop column Z. 回答1: You can grab the columns you want in the merge syntax df1 = df1.merge(df2[['weeknum', 'datetime']], on=['weeknum']) This will make sure you don't have any unwanted columns of df2 in

Subject Oriented or Refinements with builtin python objects

由 橙三吉。 提交于 2019-12-06 13:52:14
问题 Goal: Extend abitrary classes with roles that are only valid in a certain context. This works: # from https://github.com/niccokunzmann/wwp/blob/master/C_builtinTypes.py from relative import roleOf, useRoles @roleOf(int) class NaturalNumber: # int gets successor only in this module @property def successor(self): return 1 + self @roleOf(tuple) @roleOf(list) class MyList: @property def first(self): return self[0] @useRoles def test(): # this is possible if we recompile the code objects i = 1

BlackBerry - List with checkbox along with search criteria

由 家住魔仙堡 提交于 2019-12-06 12:03:59
问题 I am trying to display a list of data with checkboxes, where user can select multiple items at one time... I want a search field on top of the list which will search through the list... How do I do it? 回答1: Explanation First, create a vector with all list fields, so you will be able to add and remove them on screen at any time. When you create screen, add them all to list control. Now, lets say you have one of those EditFields - your search field. You can set a listener for it and catch text

$lookup when foreign field is an array

由 ￣綄美尐妖づ 提交于 2019-12-06 06:36:50
问题 I have two collections. Sports : { "_id" : ObjectId("5bcaf82120e047301b443c06"), "item_name" : "Football", "item_icon" : "ps_icon_football.png", "slot_divisions" : { "0" : { "div_id" : ObjectId("5bd037ec5021b307e793f7b3"), "description" : "5x5" }, "1" : { "div_id" : ObjectId("5bd0384b5021b307e793f7b4"), "description" : "7x7" } }) Booking : { "_id" : ObjectId("5be015bd870565038c7660f4"), "spot" : ObjectId("5bd825cb8705651b1c2f17e2"), "date" : ISODate("2018-11-13T10:04:45.000Z"), "slots" : [ {
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