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20个命令行工具监控 Linux 系统性能 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...60 3.65 1.04 4.29 0.00 88.42
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
cciss/c0d0 17.79 545.80 256.52 855159769 401914750
cciss/c0d0p1 0.00 0.00 0.00 5459 3518
cciss/c0d0p2 16.45 533.97 ...
How to dynamically create a class?
... Note also that you will have to use reflection to examine, read and update fields in your dynamic type. If you want intellisense and no reflection, you have to have a static base class or interface that your dynamic class inherits from and can be casted to. In that case you can modif...
Oracle “Partition By” Keyword
...n against this records salary without a sub select, which is much faster.
Read the linked AskTom article for further details.
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Is there an auto increment in sqlite?
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Have you read this? How do I create an AUTOINCREMENT field.
INSERT INTO people
VALUES (NULL, "John", "Smith");
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How do I properly compare strings in C?
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@incompetent — if you read a line from a file with fgets(), then the string might be "abc\n" because fgets() keeps the newline. If you compare that with "abc", you will get 'not equal' because of the difference between a null byte terminating "ab...
How do you pass multiple enum values in C#?
Sometimes when reading others' C# code I see a method that will accept multiple enum values in a single parameter. I always thought it was kind of neat, but never looked into it.
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SVN+SSH, not having to do ssh-add every time? (Mac OS)
...ssh/your_key_here. This adds the key to your keychain. Some places, I have read that this is enough, but I wasn't certain. This is also mac-specific, so if you need to do this on another unix flavor, you won't have this option necessarily.
For good measure, I edited the ~/.ssh/config file (you may ...
Is it possible to use 'else' in a list comprehension? [duplicate]
..., several expressions can be nested, resulting in more elses and harder to read code:
>>> ["A" if b=="e" else "d" if True else "x" for b in "comprehension"]
['d', 'd', 'd', 'd', 'd', 'A', 'd', 'A', 'd', 'd', 'd', 'd', 'd']
>>>
On a related note, a comprehension can also contain ...
Replace part of a string with another string
... Is this still the only solution in 2018? If so and any C++ committee are reading this, sort it out. It's embarrassing. split(string, string) and replace(string, string) please!
– user997112
Jul 31 '18 at 12:53
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How does one reorder columns in a data frame?
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@BramVanroy nope, c(1,3,"Var1", 2) will be read as c("1","3","Var1", "2") because vectors can contain data of only one type, so types are promoted to the most general type present. Because there are no columns with the character names "1", "3", etc. you'll get "undefi...