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Look up all descendants of a class in Ruby
... @AmolPujari p ObjectSpace.each_object(Class) will print out all the classes. You can also get the descendants of any class you want by substutiting its name for self in the line of code in the method.
– BobRodes
Apr 3 '19 at 20:38
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How to check date of last change in stored procedure or function in SQL server
...as changed last time. I know how to check creation date (it is in function properties window in SQL Server Management Studio).
I found that in SQL Server 2000 it wasn't possible to check modify date ( look at this post: Is it possible to determine when a stored procedure was last modified in SQL ...
Where is the “Fold” LINQ Extension Method?
I found in MSDN's Linq samples a neat method called Fold() that I want to use. Their example:
2 Answers
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How do I obtain the frequencies of each value in an FFT?
...0 / 1024 = 22006.9 Hz
Note that for a real input signal (imaginary parts all zero) the second half of the FFT (bins from N / 2 + 1 to N - 1) contain no useful additional information (they have complex conjugate symmetry with the first N / 2 - 1 bins). The last useful bin (for practical aplications...
Float vs Decimal in ActiveRecord
...r that is how the IEEE specification defines floats in binary format. Basically, it stores sign, fraction and exponent to represent a Float. It's like a scientific notation for binary (something like +1.43*10^2). Because of that, it is impossible to store fractions and decimals in Float exactly.
Th...
了解 Boost Filesystem Library - C/C++ - 清泛网 - 专注C/C++及内核技术
...即使其他程序在访问同一文件也如此！
unsigned long remove_all(const path& p)：此 API 尝试删除路径 p 所引用的文件或目录。与 remove 不同，此函数并不会特殊考虑不为空的目录。此函数是 UNIX rm –rf 命令的 Boost 对等项。
实用工具...
Can I add jars to maven 2 build classpath without installing them?
...the answers you'll find around the internet will suggest you to either install the dependency to your local repository or specify a "system" scope in the pom and distribute the dependency with the source of your project. But both of these solutions are actually flawed.
Why you shouldn't apply the "I...
How can I add to List
...t<? extends T> because you can't guarantee what kind of List it is really pointing to, so you can't guarantee that the object is allowed in that List. The only "guarantee" is that you can only read from it and you'll get a T or subclass of T.
The reverse logic applies to super, e.g. List<?...
Declaring a custom android UI element using XML
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The Android Developer Guide has a section called Building Custom Components. Unfortunately, the discussion of XML attributes only covers declaring the control inside the layout file and not actually handling the values inside the class initialisation. The steps are as...
What does inverse_of do? What SQL does it generate?
... belongs_to :dungeon, :inverse_of => :evil_wizard
end
In this case, calling dungeon.traps.first.dungeon should return the original dungeon object instead of loading a new one as would be the case by default.
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