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How do I add indices to MySQL tables?
...le` ADD INDEX `product_id_index` (`product_id`)
Never compare integer to strings in MySQL. If id is int, remove the quotes.
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Calling shell functions with xargs
... You can simplify this by including the argument from xargs in the command string for bash with bash -c 'echo_var "{}"'. So you do not need the _ {} at the end.
– phobic
Jun 2 '16 at 8:57
...
super() raises “TypeError: must be type, not classobj” for new-style class
...pe(OldStyle()) is the instance type, which does inherit from object. Basically, an old-style class just creates objects of type instance (whereas a new-style class creates objects whose type is the class itself). This is probably why the instance OldStyle() is an object: its type() inherits from ob...
Why does sun.misc.Unsafe exist, and how can it be used in the real world?
...}, such as {@link
java.util.concurrent.atomic.AtomicLongArray}, require extra memory ordering
guarantees which are generally not needed in these algorithms and are also
expensive on most processors.
SoyLatte - java 6 for osx javadoc excerpt
/** Base class for sun.misc.Unsafe-based F...
How to find out element position in slice?
... }
}
return -1
}
And usage:
xs := []int{2, 4, 6, 8}
ys := []string{"C", "B", "K", "A"}
fmt.Println(
SliceIndex(len(xs), func(i int) bool { return xs[i] == 5 }),
SliceIndex(len(xs), func(i int) bool { return xs[i] == 6 }),
SliceIndex(len(ys), func(i int) bool { return ys[i]...
Method Resolution Order (MRO) in new-style classes?
...ject'>)
with A forced to come in resolution order only once and after all of its subclasses, so that overrides (i.e., C's override of member x) actually work sensibly.
It's one of the reasons that old-style classes should be avoided: multiple inheritance with "diamond-like" patterns just doesn...
What is the difference between `git merge` and `git merge --no-ff`?
...author mentioned "specific branch topology" means that in --no-ff case an extra merge commit serves as the marker of the merge. The pros is explicit merge marker with names of the author and the merger. The cons is non-linear history that looks like a set of converging railroad tracks. A possible p...
计算统计特征（正态分布）函数及实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...AX_VAR;
double _ave;
//double _var;
double _sam_stdev;
double _all_stdev;
double _sum;
double _sum_2;
int _count;
double _min_v;
double _max_v;
StdevInfo()
: _ave(0.0)
//, _var(MAX_VAR)
, _sam_stdev(sqrt(MAX_VAR))
, _all_stdev(0.0)
, _sum(0.0)
...
How do I get a PHP class constructor to call its parent's parent's constructor?
I need to have a class constructor in PHP call its parent's parent's (grandparent?) constructor without calling the parent constructor.
...
What is the runtime performance cost of a Docker container?
...
Now some examples of memory (read the paper for details, memory can be extra tricky):
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