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What is the strict aliasing rule?
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A typical situation where you encounter strict aliasing problems is when overlaying a struct (like a device/network msg) onto a buffer of the word size of your system (like a pointer to uint32_ts or uint16_ts). When you overlay a struct onto such a buffer, or a buffer onto such a struct th...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
... quick-and-dirty way to make sure that only one instance of a shell script is running at a given time?
40 Answers
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Why does C++ require a user-provided default constructor to default-construct a const object?
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This was considered a defect (against all versions of the standard) and it was resolved by Core Working Group (CWG) Defect 253. The new wording for the standard states in http://eel.is/c++draft/dcl.init#7
A class type T is ...
What is the main difference between PATCH and PUT request?
...re probably one of the most cryptic things about the HTTP protocol. They exist, and there are many of them, but why do they exist?
Rails seems to want to support many verbs and add some verbs that aren't supported by web browsers natively.
Here's an exhaustive list of http verbs: http://annevankes...
What is the minimum valid JSON?
...(at the start of "2") a JSON text as being a serialized object or array.
This means that only {} and [] are valid, complete JSON strings in parsers and stringifiers which adhere to that standard.
However, the introduction of ECMA-404 changes that, and the updated advice can be read here. I've also w...
What do the result codes in SVN mean?
... repo were automatically merged into the working copy
M: Working copy is modified
C: This file conflicts with the version in the repo
?: This file is not under version control
!: This file is under version control but is missing or incomplete
A: This file will be added to v...
How to find and return a duplicate value in array
arr is array of strings:
20 Answers
20
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What is SYSNAME data type in SQL Server?
What is the SQL Server SYSNAME data type for? BOL says:
8 Answers
8
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What is PECS (Producer Extends Consumer Super)?
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tl;dr: "PECS" is from the collection's point of view. If you are only pulling items from a generic collection, it is a producer and you should use extends; if you are only stuffing items in, it is a consumer and you should use super. If yo...
指定组件的大小 · App Inventor 2 中文网
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指定组件的大小
When you create a visible component in the designer, you are typically given the opportunity to specify its height and width. There are four choices:
Automatic: Size is chosen by the system
Fill parent: Size is chosen to fill the space a...