alias

问题 I want to create an alias for a funcion name in C#. Is there any way but function overloading? public class Test { public void A() { ... } } I want to call B replace A same below. var test = new Test(); test.B(); 回答1: You can use an extension method public static class Extensions { public static void B(this Test t) { t.A(); } } But it is not an alias. It is a wrapper. EDIT ps: I agree with the commenters on your question that we'd be able to give better answers if we knew what you really

问题 int f1(int a, int b) { return a+b; } int f2(int a, int b) { return a*b; } template <typename F> void foo(int i, int j) { // do some processing before F(i,j); // do some processing after } I want to make an alias to a specialization of foo like this: constexpr auto foo1 = &foo<f1>; constexpr auto foo2 = &foo<f2>; and call the function like this: foo1(1,2);foo2(1,2); Any way to achieve this in C++? Thanks! Edit: foo() is not a wrapper of f1, it is a function that calls f1 or f2. I need to do

问题 When the type name is too long, in C# i can create alias like this: using Dict = System.Collections.Generic.Dictionary<string, string>; And I can use it like this: Dict d = new Dict(); d.Add("key", "value"); Can I create an alias similar to this in Java? 回答1: You can't create an alias, but you can import packages (JLS 7.5 Import Declarations) so that you don't have to fully qualify class names in that package. import java.util.*; import java.lang.reflect.Field; .... Set<Field> s = ... // Set

问题 Suppose I have a class Utility in a file utility.h : class Utility { public: static double longDescriptiveName(double x) { return x + 42; } }; And then I find that I use the function longDescriptiveName(...) a LOT. So like an irresponsible C++ programmer that I am when I've had too much coffee, I create a new file utilitymacros.h and add the following there: #define ldn Utility::longDescriptiveName Now I include "utilitymacros.h" in any *.cpp where I use ldn(...) and my heart is filled with

问题 I am using an OLE DB command in SSIS for which the SQL command looks like this: UPDATE DBO.CLIENT SET TimeZoneID = ?, DaylightSavingTime = ?, ModifiedBy = ?, MicrosPropertyID = ?, IsOffline = ?, GlobalReporting_MaskPatronNumberType = ?, GlobalReporting_PatronNumberReadableCharacters = ?, GlobalReporting_MaskPrimaryCardType = ?, GlobalReporting_PrimaryCardReadableCharacters = ?, BICAddedDateTime = ?, BICUpdatedDateTime = ?, IsDBInDailyBoardRate = ? WHERE ClientID = ? When I try to do the

问题 I'm using SqlServer 2005 and I have a column that I named. The query is something like: SELECT id, CASE WHEN <snip extensive column definition> END AS myAlias FROM myTable WHERE myAlias IS NOT NULL However, this gives me the error: "Invalid column name 'myAlias'." Is there a way to get around this? In the past I've included the column definition in either the WHERE or the HAVING section, but those were mostly simple, IE COUNT(*) or whatever. I can include the whole column definition in this

问题 The doskey command separator ( $T ) generates a blank line when the command produces no output. C:\> set "a=" C:\> set "b=" C:\> doskey test=set "a=foo" $T set "b=bar" $T echo ^%a^% ^%b^% C:\> test C:\> C:\> foo bar Note the blank line after issuing test , which affects readability. There is a well-known ^? alternative to $T , which does not add blanks, but the new command does not inherits environment variables. C:\> set "a=" C:\> set "b=" C:\> doskey test=set "a=foo" ^& set "b=bar" ^& echo

问题 I am curious what you think is the best way to get this MySQL database to work. i had this table: family.id family.name family.related And thought it wouldnt be a problem to connect related family members together in 1 query like this: id | name | related 1 | Name1 | 2 | Name2 | 3,5 3 | Name3 | 4 | Name4 | 5 | Name5 | 4,1 6 | Name6 | 7 | Name7 | 8 | Name8 | 6 9 | Name9 | 7 So Name2 is related to Name3 and Name5, where Name5 have other related id's, so i should make a query to get the

问题 As it can be available on heroku (wildcard CNAME's), can google cloud run be configured with a single ALIAS type record ? @ 300 IN ALIAS ghs.googlehosted.com. 回答1: Google Cloud Run requires a CNAME Resource Record to verify the custom domain. Cloud Run Custom Domains do not support domain wildcards. You specify a domain name, Google verifies the domain name. There are no configuration settings to support wildcards. The actual DNS resource records are A, AAAA, and CNAME. However, Cloud Run

问题 I saw the following code: SELECT u.ID, u.username, u.active, u.email, u.admin, u.banned, u.name AS groupmemberships FROM users u WHERE u.ID={$uid} and was wondering where the official documentation about aliasing multiple columns was. W3schools (not the best source) as the only place where I found "documentation" in the following way: SELECT column_name(s) FROM table_name AS alias_name; http://www.w3schools.com/sql/sql_alias.asp I would appreciate a link to official documentation so I can