大约有 16,000 项符合查询结果（耗时：0.0223秒） [XML]
Count, size, length…too many choices in Ruby?
...nt part from the implementation of array.count:
static VALUE
rb_ary_count(int argc, VALUE *argv, VALUE ary)
{
long n = 0;
if (argc == 0) {
VALUE *p, *pend;
if (!rb_block_given_p())
return LONG2NUM(RARRAY_LEN(ary));
// etc..
}
}
The code for array...
What is a bank conflict? (Doing Cuda/OpenCL programming)
...L, and I cannot figure out what a bank conflict is. They just sort of dive into how to solve the problem without elaborating on the subject itself. Can anybody help me understand it? I have no preference if the help is in the context of CUDA/OpenCL or just bank conflicts in general in computer scien...
CALayer with transparent hole in it
...h Jon Steinmetz suggestion. If any one cares, here's the final solution:
int radius = myRect.size.width;
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, self.mapView.bounds.size.width, self.mapView.bounds.size.height) cornerRadius:0];
UIBezierPath *circlePath = [UIBez...
Should I always use a parallel stream when possible?
...rformance will anyway be driven by the synchronized access to System.out.println(), and making this process parallel will have no effect, or even a negative one.
Moreover, remember that parallel streams don't magically solve all the synchronization problems. If a shared resource is used by the pred...
Adding 'serial' to existing column in Postgres
I have a small table (~30 rows) in my Postgres 9.0 database with an integer ID field (the primary key) which currently contains unique sequential integers starting at 1, but which was not created using the 'serial' keyword.
...
What is a None value?
...s the None value, but unfortunately this book isn't very clear at some points. I thought that I would find the answer to my question, if I share it there.
...
Difference between size_t and std::size_t
...re the same as C header (see the quotation below). Its defined as unsigned integer type of the result of the sizeof operator.
C Standard says in §17.7/2,
size_t which is the unsigned integer type of the result of the sizeof operator
And C++ Standard says (about cstddef header) in §18.1/3,
...
Handler vs AsyncTask vs Thread [closed]
... Synchronization with the main thread if you post back results to the user interface
No default for canceling the thread
No default thread pooling
No default for handling configuration changes in Android
And regarding the AsyncTask, as the Android Developer's Reference puts it:
AsyncT...
Does MySQL ignore null values on unique constraints?
...
Yes, MySQL allows multiple NULLs in a column with a unique constraint.
CREATE TABLE table1 (x INT NULL UNIQUE);
INSERT table1 VALUES (1);
INSERT table1 VALUES (1); -- Duplicate entry '1' for key 'x'
INSERT table1 VALUES (NULL);
INSERT table1 VALUES (NULL);
SELECT * FROM table1;
Result:...
Why does the use of 'new' cause memory leaks?
...e duration. It won't get cleaned up automatically.
You need to pass a pointer to it to delete in order to clean it up:
However, your second example is worse: you're dereferencing the pointer, and making a copy of the object. This way you lose the pointer to the object created with new, so you ...