大约有 32,000 项符合查询结果（耗时：0.0654秒） [XML]
Is it safe to check floating point values for equality to 0?
...hat .1 is a repeating decimal in binary and can't be represented exactly. Then compare that to this code:
double d1 = 10.0 * .1; // make sure the compiler hasn't optimized the .1 issue away
bool b = ( d1 - 1.0 == 0.0 );
I'll leave you to run a test to see the actual results: you're more likely t...
How to get UILabel to respond to tap?
...in the storyboard with no additional code. Add a label to the storyboard, then add a tap gesture to the label. In the Utilities pane, make sure "User Interaction Enabled" is checked for the label. From the tap gesture (at the bottom of your view controller in the storyboard), ctrl+click and drag ...
What is the meaning of the term arena in relation to memory?
...ena is just a large, contiguous piece of memory that you allocate once and then use to manage memory manually by handing out parts of that memory. For example:
char * arena = malloc(HUGE_NUMBER);
unsigned int current = 0;
void * my_malloc(size_t n) { current += n; return arena + current - n; }
...
How to use QueryPerformanceCounter?
...artCounter() was last called as a double, so if GetCounter() returns 0.001 then it has been about 1 microsecond since StartCounter() was called.
If you want to have the timer use seconds instead then change
PCFreq = double(li.QuadPart)/1000.0;
to
PCFreq = double(li.QuadPart);
or if you want m...
INotifyPropertyChanged vs. DependencyProperty in ViewModel
...
It's clear then, that the Dependecy Properties are solely built for the UI and not for the business layer.
– Andrei Rînea
May 4 '10 at 7:29
...
How to create an installer for a .net Windows Service using Visual Studio
...a screen that is all gray and talks about dragging stuff from the toolbox.
Then right click on the gray area and select add installer. This will add an installer project file to your project.
Then you will have 2 components on the design view of the ProjectInstaller.cs (serviceProcessInstaller1 and ...
Confused about Service vs Factory
... a method that calls $injector.instantiate on the provided function, which then calls new. (See Docs)
– citizenslave
Feb 13 '14 at 8:31
14
...
Best way to detect that HTML5 is not supported
...uch faster than that anyway. If you memoise a function that tests for this then you only need to pay the cost once.
– Drew Noakes
Jan 16 '13 at 12:08
1
...
How to get certain commit from GitHub project
...ownload a commit is to click on the commits tab when viewing a repository. Then instead of clicking on the commit name, click on Browse the repository at this point in the history button with <> symbol to the right side of the commit name/message, and finally on the Download ZIP button that co...
How do I install PyCrypto on Windows?
...t is compatible with the Visual Studio binaries distributed by Python.org, then you should stick to installing only pure Python packages or packages for which a Windows binary is available.
Fortunately, there are PyCrypto binaries available for Windows:
http://www.voidspace.org.uk/python/modules.sh...