accessor

问题 At the moment, TypeScript does not allow use get/set methods(accessors) in interfaces. For example: interface I { get name():string; } class C implements I { get name():string { return null; } } furthermore, TypeScript does not allow use Array Function Expression in class methods: for ex.: class C { private _name:string; get name():string => this._name; } Is there any other way I can use a getter and setter on an interface definition? 回答1: You can specify the property on the interface, but

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago . This is something I'm not much consistent about and always curious about what other people do. How do you access internal properties (private or public)? For example you've got this property : Private _Name As String Public Property Name() As String Get Return _Name End Get

问题 Several questions about accessor methods in C++ have been asked on SO, but none was able satisfy my curiosity on the issue. I try to avoid accessors whenever possible, because, like Stroustrup and other famous programmers, I consider a class with many of them a sign of bad OO. In C++, I can in most cases add more responsibility to a class or use the friend keyword to avoid them. Yet in some cases, you really need access to specific class members. There are several possibilities: 1. Don't use

问题 I was just curious about this: the following code will not compile, because we cannot modify a foreach iteration variable: foreach (var item in MyObjectList) { item = Value; } But the following will compile and run: foreach (var item in MyObjectList) { item.Value = Value; } Why is the first invalid, whereas the second can do the same underneath (I was searching for the correct english expression for this, but I don't remember it. Under the...? ^^ ) 回答1: foreach is a read only iterator that

问题 Previously ORM's i've used have mapped database columns directly to class properties which allowed you to specific property visibility, just as you normally would to restrict access to certain properties e.g. passwords. With Eloquent i can't seem to replicate this because database columns are mapped to the internal attributes array which contain no visibility. My desire is to restrict the scope of access to a user password to only the object i.e. private. Setting a class property with

问题 i was looking around in stackoverflow whether putting null coalescing operators within an accessor method has any performance implications. Before: private Uri _Url; public Uri Url { if(_Url == null) _Url = new Uri(Utilities.GenerateUri()); return _Url; } After: private Uri _Url; public Uri Url { get { return _Url = _Url ?? new Uri(Utilities.GenerateUri()); } } I'm not even sure if the syntax is correct, but when i debug, the private object is set. Before anyone ask what's the point of doing

问题 What is the difference? Also, why does this not work: The variables such as base_path are not being set. class Cvit < ActiveRecord::Base attr_accessible :species,:program,:textup,:e_value,:filter,:min_identity,:cluster_dist,:fileup_file_name attr_accessor :base_path, :fa_file, :text_file, :dbase, :source, :bl_file, :bl_sorted, :gff_file, :cvt_file, :db, :overlay_coords_gray def initilize(*args) super(*args) end def cvitSetup() self.base_path = "blast_cvit/" self.fa_file = "input.fa" . . end

问题 Using DBIx::Class I am trying to manipulate the data of a column whenever it is being updated or retrieved. For instance, before it goes into the database I would like to encrypt it, and whenever it is being accessed I would like to decrypt it. I am following this example in the DBIx::Class::Manual::Cookbook, however I can't seem to get it to work. I have placed the following in my User schema. For testing I am just using the name column, I know it doesn't make sense: __PACKAGE__->add_columns

问题 I'm currently implementing a poor-man's version of the RSA Algorithm and I wanted the prime numbers d, e, m, and n to be read-only as they will be automatically generated within ithe constructor body. However, I get two different results when I type: class RSA { public RSA() { n = 4; } private long n { get; private set; } } or class RSA { public RSA() { n = 4; } private long n { get; } } Reading the book Accelarated C#, I got the impression that a private set function can be implemented with

问题 I am confused by an error returned by my Python script: all_treatments['date'] = pd.to_datetime(all_treatments['INDATUMA']) all_treatments['year'] = all_treatments['date'].dt.year The error: Traceback (most recent call last): File "treatments2_noiopro.py", line 93, in <module> all_treatments['year'] = all_treatments['date'].dt.year File "/home/seidav/anaconda/lib/python2.7/site-packages/pandas/core/generic.py", line 2145, in __getattr__ return object.__getattribute__(self, name) File "/home