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Why sizeof built in types except char is compiler dependent in C & C++?

Why are fundamental types in C and C++ not strictly defined like in Java where an int is always 4 bytes and ... and does it serve any purpose? See Question&Answers more detail:os...

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java - Android Studio installs without sdkmanager

I've been programming in Flutter using macOS 10.15.3, targeting iOS devices. Today I tried installing Android ... I overlooked something basic. See Question&Answers more detail:os...

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Does Javascript handle integer overflow and underflow? If yes, how?

We know that Java does not handle underflows and overflows, but how does Javascript handle these for integers? ... based on its characters. See Question&Answers more detail:os...

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iphone - Removing time components from an NSDate object using Objective C/Cocoa

I'm trying to write a simple function using Objective C that accepts an NSDate object and returns an ... dateFromComponents:components]; } See Question&Answers more detail:os...

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java - How do I get the row count in JDBC?

I've executed a JDBC query to obtain a resultset. Before iterating over it, I'd like to quickly find out ... and the latest Oracle JDBC drivers. See Question&Answers more detail:os...

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c# - How to rename <ArrayOf> XML attribute that generated after serializing List of objects

I am serializing List of objects List<TestObject> , and XmlSerializer generates <ArrayOfTestObject> attribute, I ... > </ArrayOfTestObject> See Question&Answers more detail:os...

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java - JPA Map<String,String> mapping

How can I map a Map in JPA without using Hibernate's classes? See Question&Answers more detail:os...

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c# - How to refresh an Entity Framework Core DBContext?

When my table is updated by another party, the db context in dotnet core still return the old value, how can I ... should not mess up with it. See Question&Answers more detail:os...

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c++ - Convert char array to single int?

Anyone know how to convert a char array to a single int? char hello[5]; hello = "12345"; int myNumber = ... My number is: %d", myNumber); See Question&Answers more detail:os...

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How do you dynamically create a radio button in Javascript that works in all browsers?

Dynamically creating a radio button using eg var radioInput = document.createElement('input'); radioInput.setAttribute('type' ... IE. Why not? See Question&Answers more detail:os...

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sql server - Date range overlapping check constraint

I've a simple table in sql server 2005 with 3 columns: DateStart, DateEnd and Value. I tried to set a ... range and DateEnd excludes from range. See Question&Answers more detail:os...

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xcode - CGContextSaveGState: invalid context 0x0 Error only on device

Update: I am using XCode 7 Beta with Swift 2.0 When I try to run my app on an iPhone I get these 3 errors: ... has an idea I can post more code. See Question&Answers more detail:os...

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c# - How to convert Func<T, bool> to Predicate<T>?

Yes I've seen this but I couldn't find the answer to my specific question. Given a lambda testLambda that takes T ... Any ideas how to do both? See Question&Answers more detail:os...

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java - Create new object using reflection?

Given class Value : public class Value { private int xVal1; private int xVal2; private double pVal; // ... Constructor of Value ? Thanks See Question&Answers more detail:os...

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c# - Start new process, without being a child of the spawning process

How would I go about starting a new process without it being the child of the calling process. Example: Main ... start("file.exe") Image: See Question&Answers more detail:os...

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rust - When I can use either Cell or RefCell, which should I choose?

From the std::cell documentation, I see that Cell is "only compatible with types that implement Copy". This means I ... }", cell.count()); } See Question&Answers more detail:os...

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python - Multiple keys per value

Is it possible to assign multiple keys per value in a Python dictionary. One possible solution is to assign ... two mentioned in this question. See Question&Answers more detail:os...

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sqlite - How to get the number of rows of the selected result from sqlite3?

I want to get the number of selected rows as well as the selected data. At the present I have to use two ... this problem? Thank you very much! See Question&Answers more detail:os...

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jquery - scrolltop with animate not working

I'm trying to animate while scrolling but no luck with my code... I have this jquery $(window).scrollTop(200) ... of animate but not working... See Question&Answers more detail:os...

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c# - Why is the binary output not equal when compiling again?

I'm using a build script to compile several C# projects. The binary output is copied to a result folder, ... checked in in a circle. See Question&Answers more detail:os...

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mongodb - $unwind an object in aggregation framework

In the MongoDB aggregation framework, I was hoping to use the $unwind operator on an object (ie. a JSON collection). ... , person3: 2, } } ] See Question&Answers more detail:os...

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java - Does Apache Commons HttpClient support GZIP?

Does the library Apache Commons HttpClient support Gzip? We wanted to use enable gzip compression on our Apache ... files with the Server). See Question&Answers more detail:os...

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c++ - What is the difference between using a struct with two fields and a pair?

What is the difference regarding memory allocation and efficiency between using a struct with two fields and a pair? See Question&Answers more detail:os...

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How can I call a java static method in clojure?

I wish to call class on the String class. How can I access this static method? See Question&Answers more detail:os...

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Ansible shell module returns error when grep results are empty

I am using Ansible's shell module to find a particular string and store it in a variable. But if grep did not ... if the string is not found? See Question&Answers more detail:os...

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lookbehind - How to match the first word after an expression with regex?

For example, in this text: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc eu tellus vel nunc pretium ... the word after 'ipsum'. See Question&Answers more detail:os...

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c++ - Does std::mutex create a fence?

If I lock a std::mutex will I always get a memory fence? I am unsure if it implies or ... . Multithreaded programming and memory visibility See Question&Answers more detail:os...

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Prevent file descriptors inheritance during Linux fork

How do you prevent a file descriptor from being copy-inherited across fork() system calls (without closing it, of ... 4GB RAM; average_load=0.00 See Question&Answers more detail:os...

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

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