首页 \ 问答 \ 无法组成Cats Reader Monad(Not able to compose the Cats Reader Monad)

无法组成Cats Reader Monad(Not able to compose the Cats Reader Monad)

 我写了以下代码  
case class Foo(i: Int, j:Int)
def do1() : Reader[Foo, String] = Reader(f => s"doing ${f.i}")
def do2() : Reader[Foo, String] = Reader(f => s"doing ${f.j}")
 
 现在，如果我尝试将这些组成另一个功能  
def func() : Reader[Foo, List[String]] = Reader(f =>
  for {
    m1 <- do1()
    m2 <- do2()
  } yield List(m1, m2)
 }
 
 我希望的是我会做func().run(Foo(10, 20))这会给我一个List列表（“做10”，“做20”）  
 但相反，我得到编译器错误  
type mismatch;
 found   : cats.data.Kleisli[cats.Id,$sess.cmd1.Foo,List[String]]
 required: List[String]
m1 <- do1()
   ^
Compilation Failed

I have written the following code 
case class Foo(i: Int, j:Int)
def do1() : Reader[Foo, String] = Reader(f => s"doing ${f.i}")
def do2() : Reader[Foo, String] = Reader(f => s"doing ${f.j}")
 
now if I try to compose these into another function 
def func() : Reader[Foo, List[String]] = Reader(f =>
  for {
    m1 <- do1()
    m2 <- do2()
  } yield List(m1, m2)
 }
 
What I was hoping was that I will do func().run(Foo(10, 20)) and this will give me a list of List("doing 10", "doing 20") 
but instead I get a compiler error 
type mismatch;
 found   : cats.data.Kleisli[cats.Id,$sess.cmd1.Foo,List[String]]
 required: List[String]
m1 <- do1()
   ^
Compilation Failed

原文：https://stackoverflow.com/questions/43023377

更新时间：2023-04-19 10:04

最满意答案

 这似乎是对你的情况的可能答案吗？  
 （来自http://www.uwplatt.edu/csse/tools/subversion/subversion-help.html ）  
 
  “无法添加文件”（name here）'：同名的对象已经存在。  
  要么  
  “无法打开文件”folder.svn \ tmp \ text-base \ file.svn-base'：系统找不到指定的文件。  
  两者都意味着同一个文件夹中的两个文件具有与大小写相同的名称; 例如“Readme.txt”和“README.TXT”。 Unix和Subversion区分大小写，因此这些文件被认为是完全不相关的。 但是在Windows中不区分大小写，所以当它尝试在Readme.txt（比如说）上更新README.TXT时，它会中断。  
  解决问题的最重要的方法是登录到Unix系统（如io.uwplatt.edu），并使用unix notes来查看那里的存储库。 然后，您可以使用svn mv命令重命名其中一个文件。 如果您正在尝试将文件添加到存储库中，可以尝试使用TortoiseSVN-> Rename ...将现有文件重命名为完全不同的内容，然后进行更新。 请注意，您需要使用TortoiseSVN重命名命令; 仅在Windows资源管理器中重命名该文件将无法解决您的问题。  
 
 我有同样的错误，并且使用Tortoise SVN的repo浏览器能够确认存储库中有两个文件的名称只有大小写字母。 您还可以通过删除其中一个文件（通过repo浏览器首先做差异来确保您拥有所需的内容），通过repo浏览器来解决此问题。 

Does this seem like a possible answer to your situation? 
(from http://www.uwplatt.edu/csse/tools/subversion/subversion-help.html) 
 
 "Failed to add file '(name here)': object of the same name already exists. 
 or 
 "Can't open file 'folder.svn\tmp\text-base\file.svn-base': The system cannot find the file specified." 
 Both mean that two files in the same folder have the same name except for capitalization; for example "Readme.txt" and "README.TXT". Unix and Subversion are case-sensitive, so the files are considered to be completely unrelated. But in Windows is not case-sensitive, so when it tries to update README.TXT on top of Readme.txt (say), it breaks. 
 The surest way to fix the problem is to log in to a Unix system (such as io.uwplatt.edu) and use the unix notes to check out the repository there. You can then use the svn mv command to rename one of the files. If you are in the middle of trying to add a file to your repository, you might try using TortoiseSVN->Rename... to rename the existing file to something entirely different and then updating. Note that you need to use the TortoiseSVN rename commands; merely renaming the file in Windows Explorer won't fix your problems. 
 
I had this same error, and using Tortoise SVN's repo browser was able to confirm that there were two files in the repository with the same name only varying by upper/lowercase letters. You can also fix this issue through the repo browser by deleting one of the files (you can do a diff first through repo browser to make sure you have what you need).

无法组成Cats Reader Monad(Not able to compose the Cats Reader Monad)

最满意答案

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