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rust - Borrowing references to attributes in a struct

It seems that if you borrow a reference to a struct field, the whole struct is considered borrowed. I've managed ... | - first borrow ends here See Question&Answers more detail:os...

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node.js - Mongoose optional search query parameters?

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python 3.x - Calling Cython function from C code raises segmentation fault

I'm trying to call cython (cdef) function in C program. When the cdef function contains python statements, e.g. ... value of PI will be 0. See Question&Answers more detail:os...

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r - Creating a Unique Sequence of Dates

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oop - Java method overloading + double dispatch

Can anybody explain in detail the reason the overloaded method print(Parent parent) is invoked when working with Child ... .doJob(worker); } } See Question&Answers more detail:os...

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c# - Could not find installable ISAM

I have the following code : string excelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:dbsuc.xls; ... Open() . Any ideas ? See Question&Answers more detail:os...

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jquery - What are the drawbacks of using synchronous ajax call?

This question could surely be applied to jQuery but in this case I am referring to Prototype. In the ... I would appreciate any feedback. See Question&Answers more detail:os...

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r - Stacked barchart, independent fill order for each stack

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Casting to generic type in Java doesn't raise ClassCastException?

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visual studio - Break in Class Module vs. Break on Unhandled Errors (VB6 Error Trapping, Options Setting in IDE)

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php - Calculate skip value for given record for sorted paging

I'm trying to calculate the skip value for a given record in a mongo db collection using the php driver. So ... of on the array of results. See Question&Answers more detail:os...

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bash - Why does getopts only work the first time?

Why does this option only work the first time it's used, then ignored every other time? It's like it's being ... o true $ testopts -o o false See Question&Answers more detail:os...

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python - Can I perform dynamic cumsum of rows in pandas?

If I have the following dataframe, derived like so: df = pd.DataFrame(np.random.randint(0, 10, size=(10, 1))) 0 ... , it returns: 0 2 10 6 8 See Question&Answers more detail:os...

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sql server - SQL comma-separated row with Group By clause

I have the following query: SELECT Account, Unit, SUM(state_fee), Code FROM tblMta WHERE MTA.Id = '123' GROUP ... that worked with a group by. See Question&Answers more detail:os...

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compiler construction - What are C# lambda's compiled into? A stackframe, an instance of an anonymous type, or?

What are C# lambda's compiled into? A stackframe, an instance of an anonymous type, or? I've read this ... resulting outputs from the compile. See Question&Answers more detail:os...

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How to enable SSL 3 in Java

Since Java 8 Update 31 the SSL 3 protocol is disabled by default due to security flaws in the SSL Protocol (see ... , how can it be enabled? See Question&Answers more detail:os...

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sql - How to calculate the number of "Tuesdays" between two dates in TSQL?

I'm trying to figure out how to calculate the number of "Tuesdays" between two dates in TSQL? "Tuesday"could be any value. See Question&Answers more detail:os...

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api - OpenAPI: what schema to accept any (complex) JSON value

The API for which I'm writing a Swagger 2.0 specification is basically a store for any JSON value. I want ... some languages with my API spec? See Question&Answers more detail:os...

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Add some kind of row number to a mongodb aggregate command / pipeline

The idea is to return a kind of row number to a mongodb aggregate command/ pipeline. Similar to what we've ... generate this rownum in mongodb ? See Question&Answers more detail:os...

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.net - Is there a regex flavor that allows me to count the number of repetitions matched by the * and + operators?

Is there a regex flavor that allows me to count the number of repetitions matched by the * and + operators ... possible under the .NET Platform. See Question&Answers more detail:os...

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android - Picasso IllegalArgumentException Target must not be null

I'm trying to set image by using Picasso library on my project. When I click image of the View,I'm ... ImageView image; TextView title; } } See Question&Answers more detail:os...

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php - Understanding pdo mysql transactions

The PHP Documentation says: If you've never encountered transactions before, they offer 4 major features: Atomicity, ... ) with one another. See Question&Answers more detail:os...

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python - Chaining "is" operators

Does python support chaining is operators, such as the following? a = None b = None a is b is None This ... some doc references would be nice. See Question&Answers more detail:os...

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Visual Studio 2012 C++ Standard Output

Where does fprintf(stdout/stderr) print to in Visual Studio when compiling Win32 app? I keep hearing it goes to the ... a console window in c++? See Question&Answers more detail:os...

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file - How to execute JAVA program by double clicking on icon?

I have written a java program. Now I would like to open my console java application without IDE, Eclipse etc., ... JAVA ? Thanks in advance :) See Question&Answers more detail:os...

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XAML Grid Visibility Transition?

I have a Grid that has Visibility bound to a property in my viewmodel. This all works fine -- the Grid appears ... > </Grid.RowDefinitions> ... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to perform Mouse Wheel scrolling over HTML5 Canvas in Selenium?

I am working on a GWT Application (similar to Paint). In this, I have an HTML5 Canvas in which there is a ... can be done to fix this issue? See Question&Answers more detail:os...

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javascript - Why are globals bad?

It totaly makes sense to me to use it here. What would be the alternative? How can i generaly avoid to use ... And give me a better solution? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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