lookup

Lookup table for unhashable in Python

旧巷老猫 提交于 2019-12-01 03:16:19
问题 I need to create a mapping from objects of my own custom class (derived from dict) to objects of another custom class. As I see it there are two ways of doing this: I can make the objects hashable. I'm not sure how I would do this. I know I can implement __hash__() but I'm unsure how to actually calculate the hash (which should be an integer). Since my objects can be compared I can make a list [(myobj, myotherobj)] and then implement a lookup which finds the tuple where the first item in the

Initializing Lookup<int, string>

瘦欲@ 提交于 2019-12-01 02:43:52
How do i declare a new lookup class for a property in the object initializer routine in c#? E.g. new Component() { ID = 1, Name = "MOBO", Category = new Lookup<int, string> } The category bit always get a compile error. I have a property called Category that is of the type Lookup<int, string> and I want to instantiate this property via new Component() { ID = 1, Name = "MOBO", Category = new Lookup<int, string> }; But I cannot get past the compile errors. jrotello Per MSDN documentation, there is no public constructor for the Lookup class: http://msdn.microsoft.com/en-us/library/bb460184.aspx

Implementing a Lookup Table

好久不见. 提交于 2019-12-01 01:53:11
I am working on a custom data structure and I am currently in the beta testing process: The data will be stored within an array and this array can be represented as a 4D, 2D & 1D array. These three arrays are declared within a union since it represents the same memory addressing. Here is the declaration to my class: SomeClass.h #ifndef SomeClass_H #define SomeClass_H class SomeClass { public: static const unsigned V1D_SIZE; // Single Or Linear Array Representation : Size 256 - 256 Elements static const unsigned V2D_SIZE; // 2D Array [16][16] : Size 16 - 256 Elements static const unsigned V4D

java: create a lookup table using hashmap or some other java collection?

只愿长相守 提交于 2019-11-30 23:57:37
Extending this question , I have accepted an answer which says use lookup table or hashmap for this case as it would be a better construct to handle multiple conditions . Current construct. Class to store messages. public class ProgressMessages { public static String msg1="Welcome here ....."; . . . //around 100 more similar static variables. } Condition and Display the proper message from the above class. int x=calculatedVal1(m,n); int y=calculatedVal2(o,q); SimpleDateFormat formater=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date d=new Date(); String s=formater.format(d); try { long d1 =

checking words in a dictionary [closed]

荒凉一梦 提交于 2019-11-30 22:16:36
I need to determine if an unknown 5 or 6 letter string is a valid word, i.e. is in the dictionary. I could submit the string/word to an online dictionary, but I need to check this string/word, which will be different each time, for about 100 to 150 times. This seems to be a bit time consuming. My next thought would be to try to get a dictionary program of my own. It would need to be in Java as my program is written in Java. Does the Java API already have a class for doing this? Can I get a descent one that someone has already coded, and all I have to do is submit the string/word to it? My

Initializing Lookup<int, string>

孤者浪人 提交于 2019-11-30 21:38:53
问题 How do i declare a new lookup class for a property in the object initializer routine in c#? E.g. new Component() { ID = 1, Name = "MOBO", Category = new Lookup<int, string> } The category bit always get a compile error. I have a property called Category that is of the type Lookup<int, string> and I want to instantiate this property via new Component() { ID = 1, Name = "MOBO", Category = new Lookup<int, string> }; But I cannot get past the compile errors. 回答1: Per MSDN documentation, there is

Javascript: Quickly lookup value in object (like we can with properties)

半腔热情 提交于 2019-11-30 20:33:59
I have an object that has pairs of replacement values used for simple encoding / decoding (not for security, just for a convenience; too complicated to explain it all here). It's in the form var obj = {x: y, x: y, ... }; where 'x' is the value when encoded and 'y' is the decoded value. Decoding is simple: I loop through the characters of the string, and look up the charAt(i) value in the object via brackets: obj[ str.charAt(i) ] . (I'm leaving out the check to see whether we need an uppercase or lowercase version (all key/values in the object are lowercase), but that's simple enough.) To

Confusing function lookup with templates in C++

心已入冬 提交于 2019-11-30 18:57:03
问题 Starting with the following (using gcc version 4.0.1 ): namespace name { template <typename T> void foo(const T& t) { bar(t); } template <typename T> void bar(const T& t) { baz(t); } void baz(int) { std::cout << "baz(int)\n"; } } If I add (in the global namespace) struct test {}; void bar(const test&) { std::cout << "bar(const test&)\n"; } then, as I expected, name::foo(test()); // produces "bar(const test&)" But if I just add void bar(const double&) { std::cout << "bar(const double&)\n"; }

Mongodb - regex match of keys for subdocuments

杀马特。学长 韩版系。学妹 提交于 2019-11-30 18:53:01
I have some documents saved in a collection (called urls ) that look like this: { payload:{ url_google.com:{ url:'google.com', text:'search' } } }, { payload:{ url_t.co:{ url:'t.co', text:'url shortener' } } }, { payload:{ url_facebook.com:{ url:'facebook.com', text:'social network' } } } Using the mongo CLI, is it possible to look for subdocuments of payload that match /^url_/ ? And, if that's possible, would it also be possible to query on the match's subdocuments (for example, make sure text exists)? I was thinking something like this: db.urls.find({"payload":{"$regex":/^url_/}}).count();

Find last occurrence of specific value in a row

亡梦爱人 提交于 2019-11-30 18:08:54
问题 I have a table that keeps scores from fantasy football league. The lowest scoring week is not included in the total. I'm able to find the lowest score using the =min function [=min(B2:R2)] I can find the first instance using the =match function. [=MATCH(S2,B2:R2,0)] However I would like a formula that returns the latest occurrence of the lowest scoring week. For example Portia lowest score is 8 the first occurrence is week 4 but I would like it to return the latest occurrence which is week 11