definition | 易学教程

How to redefine a command in Vim?

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问题 In vim, in my .vimrc, how can I redefine a command (i.e. :e) as something else? I want to redefine :e * as :tabe * . 回答1: I figured out a way to do it. See How to disable a built-in command in vim . From that, we can see that we can use cabbrev to change what a command does. For my needs, cabbrev e tabe is perfect. But we can generalize this solution to make commands starting with lower case characters accessible to users for user-defined ones: use cabbrev to (re)define a built-in command as

Class definition inside method argument in Java?

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问题 I have come across Java code in this form for the first time: object.methodA(new ISomeName() { public void someMethod() { //some code } }); Where ISomeName is an interface that has one method with the same signature as someMethod() above. From what I can understand, we are defining a new nameclass class that implements ISomeName, creating an object of this class using default constructor and passing the object as an argument to methodA. Is this right? What is the name of this feature? 回答1: It

Error defining and initializing multidimensional array

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I get error in compilation with the following definition. int matrix[ ][ ] = { { 1, 2, 3}, {4,5,6} }; char str[ ][ ] = { "abc", "fgh" }; Why is the compiler complaining missing subscript and too many initializers. Kricket When you declare a multi-dimensional array, you must explicitly define the size of all but the last dimension. Otherwise, the compiler won't know how to find a given value in the array. edit: read my post here If an array is defined as int arr[ ROWS ][ COLS ]; then any array notation arr[ i ][ j ] can be translated to pointer notation as *( arr + i * COLS + j ) Observe that

What is instrumentation?

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I've heard this term used a lot in the same context as logging, but I can't seem to find a clear definition of what it actually is. Is it simply a more general class of logging/monitoring tools and activities? Please provide sample code/scenarios when/how instrumentation should be used. I write tools that perform instrumentation. So here is what I think it is. DLL rewriting. This is what tools like Purify and Quantify do. A previous reply to this question said that they instrument post-compile/link. That is not correct. Purify and Quantify instrument the DLL the first time it is executed after

Declarations, definitions, initializations in C, C++, C#, Java and Python [closed]

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问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . What do the terms mean in each of the above languages? Why do the languages differ (wherever they do, if at all they do) in this respect? 回答1: C/C++: A declaration is a statement that says "here is the name of

How to group multiple parameters in Swagger 2.0?

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问题 Is it possible to group multiple parameters to reference them in multiple routes? For example I have a combination of parameters which I need in every route. They are defined as global parameters. How can I group them? I think about a definition like this: parameters: MetaDataParameters: # Meta Data Properties - name: id in: query description: Entry identification number required: false type: integer - name: time_start in: query description: Start time of flare required: false type: string -

Initialization of Objects with Static Storage Duration in C vs C++ [duplicate]

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问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: What does main return? For example, the following code compiles without any warning: #include <stdio.h> int i = i + 1; int main(int argc, char *argv[]) { fprintf (stderr, "%d\n", i); return 0; } I think this is illegal in syntax, because i is used before it's declared, is it right? And in my opinion, the appearance of int i = i + 1; is surely a bug, why doesn't the compiler warn about it? I use gcc 4.5.1. 回答1:

What exactly is Reflection and when is it a good approach?

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What exactly is Reflection? I read the Wikipedia article on this subject and I understand that it is a kind of meta-programming, where the program can modify itself at run-time, but what does this mean? In what kind of situations is this a good approach and when is it the best to use it? Reflection is a facility where you can query an object about its attributes at runtime. For example, Python, Java and .Net have facilities where you can find the instance variables or methods of an object. An example of an application for reflection is an O/R mapping layer. Some use reflection to construct an

When do I define objective-c methods?

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I'm learning Objective-C, and have a C/C++ background. In object-oriented C++, you always need to declare your method before you define (implement) it, even if it is declared in the parent class. In procedural-style C, IIRC, you can get away with just defining a function so long as it is only called from something else in the same compilational unit (ie. the same file) that came later on in the file (well, provided you don't declare it elsewhere with "extern"). Now, in Objective-C, it appears that you only need to declare selectors in the header file if they are going to be used by something

Any program or trick to find the definition of a variable?

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问题 Many times when I am watching others code I just want to find where and how a variable is defined. Normally what I do now is look for the type of the variable until I find the definition, that is very time consuming. And I guess that there are some tools that can help me in this rutinary situation. Any suggestion in some tools or commands to help me in this task?. I know that using a GUI and creating a project this is done automatically I am talking of a way to do this without a GUI. I am