大约有 3,516 项符合查询结果（耗时：0.0420秒） [XML]
Are there disadvantages to using a generic varchar(255) for all text-based fields?
...However: "When sending a key to the handler for index_read() or records_in_range, we always use a 2-byte length for the VARCHAR to make things simpler." See forge.mysql.com/wiki/MySQL_Internals_MyISAM
– Bill Karwin
Feb 12 '11 at 18:56
...
Why is list initialization (using curly braces) better than the alternatives?
...nt> c(it1,it2); //like filling the vector with 10 integers or copying a range.
vector<int> d{}; //empty braces -> default constructs vector, which is equivalent
//to a vector that is filled with zero elements
...
How can you program if you're blind?
...le can work as lawyers, journalists, teachers but a blind developer is a strange concept even for the blind. Many times I feel alone because some blind friends of mine can't understand my work.
You can read my opinion about this issue in this article, in Spanish, in my blog http://www.programaraci...
Why is std::map implemented as a red-black tree?
...ardware, and exact usage, but since library authors have to support a wide range of usage patterns, they have to take an educated guess. AVL is also slightly harder to implement, so you might want a proven benefit to use it.
– Steve Jessop
Mar 13 '11 at 11:57
...
Most efficient way of making an if-elif-elif-else statement when the else is done the most?
...oop.
Consider these examples...
1.py
something = 'something'
for i in xrange(1000000):
if something == 'this':
the_thing = 1
elif something == 'that':
the_thing = 2
elif something == 'there':
the_thing = 3
else:
the_thing = 4
2.py
something = 's...
What does pylint's “Too few public methods” message mean
...gree, and from 2020 on it's the standard way to go. To have a wide-version-range mechanism (2.7, 3.3+ if I remember) you could use the attrs library, which was actually the blueprint for creating the dataclasses module.
– Tomasz Gandor
Apr 3 '19 at 9:55
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What is a sealed trait?
...SON
with additional subclasses.
While the set of sub-classes is fixed, the range of operations we may want to do on a JSON blob is
unbounded: parse it, serialize it, pretty-print it, minify it, sanitize it, etc.
Thus it makes sense to model a JSON data structure as a closed sealed trait
hierarchy ra...
Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
...and changing the order can easily cause temporaries to exceed the possible range of the exponent. (Not exactly the same, because the exponent doesn't suffer loss of precision... but the representation is still quite limited, and reordering can lead to unrepresentable values)
–...
Remove accents/diacritics in a string in JavaScript
...d as e + ̀.
Using a regex character class to match the U+0300 → U+036F range, it is now trivial to globally get rid of the diacritics, which the Unicode standard conveniently groups as the Combining Diacritical Marks Unicode block.
See comment for performance testing.
Alternatively, if you just...
What is a “context bound” in Scala?
... which forms an array from the results of applying
a given function f on a range of numbers from 0 until a given length. Up to Scala 2.7, tabulate could be
written as follows:
def tabulate[T](len: Int, f: Int => T) = {
val xs = new Array[T](len)
for (i <- 0 until len) xs(i) = f(i)
...