scope

问题 I have a function inside a function that I need to access directly. //############################################################# //# Global vars //############################################################# var canvasWidth = 585; var canvasHeight = 780; //############################################################# //# Init the canvas //############################################################# window.onload = function() { initStage(); }; //###########################################

问题 qmake provides several built-in platform scopes, allowing a project file to perform different operations depending on the current platform: win32 { ... } unix { ... } All platform specifications in the mkspecs directory can also be used to test various platform/compiler combination, e.g. linux-g++ { ... } win32-g++ { ... } win32-msvc2003 { ... } However, I can't seem to find a way to test only the compiler (without the os) #This does not work g++ { ... } msvc { ... } Is there a way to do this

问题 Is the static keyword in C used only for limiting the scope of a variable to a single file? I need to know if I understood this right. Please assume the following 3 files, file1.c int a; file2.c int b; file3.c static int c; Now, if the 3 files are compiled together, then the variables "a" & "b" should have a global scope and can be accessed from any of the 3 files. But, variable "c" being static, can only be accessed from file3.c, right? Does static have any other use in C ? (other than to

问题 In python (tested on 2.7.6) all variables are statically bound to a scope at compile time. This process is well described in http://www.python.org/dev/peps/pep-0227/ and http://docs.python.org/2.7/reference/executionmodel.html It is explicitly stated that "If a name binding operation occurs anywhere within a code block, all uses of the name within the block are treated as references to the current block." A function is a code block so the following code with fail because x is assigned after

问题 Background Even though it's possible to compile C# code at runtime, it's impossible to include and run the generated code in the current scope. Instead all variables have to be passed as explicit parameters. Compared with dynamic programming languages like Python, one could never truly replicate the complete behaviour of eval (as in this example). x = 42 print(eval("x + 1")) # Prints 43 The question So my question is (regardless if it's actually useful ;)) whether it's possible to mimic

问题 Problem Background Generating and accessing data of a fixed column layout is easy. You can create local temp tables up-front, and populate them by calling stored procedures. On the other hand, if you want to generate data with a dynamic column layout, you must generally build an SQL statement dynamically and execute it with "exec sp_executesql". Since the data layout is unknown at run-time, you cannot create a temp-table up-front, and once inside the "exec sp_executesql" statement, any

问题 How this simple task can be done in Ruby? I have some simple config file === config.rb config = { 'var' => 'val' } I want to load config file from some method, defined in main.rb file so that the local variables from config.rb became local vars of that method. Something like this: === main.rb Class App def loader load('config.rb') # or smth like that p config['var'] # => "val" end end I know that i can use global vars in config.rb and then undefine them when done, but i hope there's a ruby

问题 How this simple task can be done in Ruby? I have some simple config file === config.rb config = { 'var' => 'val' } I want to load config file from some method, defined in main.rb file so that the local variables from config.rb became local vars of that method. Something like this: === main.rb Class App def loader load('config.rb') # or smth like that p config['var'] # => "val" end end I know that i can use global vars in config.rb and then undefine them when done, but i hope there's a ruby

问题 I am having an issue trying to figure out var scoping on xslt. What I actually want to do it to ignore 'trip' tags that have a repeated 'tourcode'. Sample XML: <trip> <tourcode>X1</tourcode> <result>Budapest</result> </trip> <trip> <tourcode>X1</tourcode> <result>Budapest</result> </trip> <trip> <tourcode>X1</tourcode> <result>Budapest</result> </trip> <trip> <tourcode>Y1</tourcode> <result>london</result> </trip> <trip> <tourcode>Y1</tourcode> <result>london</result> </trip> <trip> <tourcode

问题 Which is the default scope of a Spring 4 @Service ? Does it make sense designing a Service implementation to store info about the current logged user (according to the current HTTP session ), through class attributes (also by using the final modifier)? 回答1: Which is the default scope of a Spring 4 @Service? The default scope is singleton It is reasonable to design a Service implementation in order to store some info, related to the current logged user (according to the current HTTP session)