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What makes Lisp macros so special?
...efines a couple of special syntax forms. The quote (') indicates the next token is a literal. The quasiquote or backtick (`) indicates the next token is a literal with escapes. Escapes are indicated by the comma operator. The literal '(1 2 3) is the equivalent of Python's [1, 2, 3]. You can as...
Make UINavigationBar transparent
...at colorMask[6] = {222, 255, 222, 255, 222, 255};
UIImage *img = [[UIImage alloc] init];
UIImage *maskedImage = [UIImage imageWithCGImage: CGImageCreateWithMaskingColors(img.CGImage, colorMask)];
[nav.navigationBar setBackgroundImage:maskedImage forBarMetrics:UIBarMetricsDefault];
[img release];
...
Function pointers, Closures, and Lambda
...riables. The compiler created a new closure (not function) dynamically by allocating a new record containing a pointer to the same code, but with different values for the free variables.
You can simulate all this in C, but it is a pain in the ass. Two techniques are popular:
Pass a pointer to ...
Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?
...localhost', '127.0.0.1'), 'api/sessions'),
params={'token': ss.get('token', '')})
for nn in json.loads(response.text):
for kernel in active_kernels:
for arg in kernel[-1]:
if arg.count(nn['kernel']['id']):
...
C++模板-继承-具现化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...(new_handler) throw();
static void* operator new (size_t size) throw(bad_alloc);
private:
static new_handler currentHandler;
};
template<typename T>
new_handler NewHandlerSurpport<T>::set_new_handler(new_handler p) throw()
{
new_handler oldHander = currentHandler;
currentHandler = p;...
VS Debug调试模式下内存泄露检测原理 - C/C++ - 清泛网 - 专注C/C++及内核技术
...存泄露检测原理内存泄露检测基本原理：程序调用new、malloc、realloc等内存分配函数时，将分配的内存地址，分配的大小、第几次分配、分配函数调用所在的文...内存泄露检测基本原理：
程序调用new、malloc、realloc等内存分配函...
throw new std::exception vs throw std::exception
... clean it up at the appropriate time.
Throwing a pointer to a dynamically allocated object is never a good idea. Exceptions are supposed to enable you to write more robust code in the face of error conditions. If you throw an exception object in the conventional manner you can be sure that whether ...
string c_str() vs. data()
... @taz Even when storing binary data, C++11 requires that std::string allocate an extra char for a trailing '\0'. When you do std::string s("\0");, both s.data()[0] and s.data()[1] are guaranteed to evaluate to 0.
– bcrist
Sep 15 '13 at 7:30
...
How to save picture to iPhone photo library?
... AssetsLibrary framework
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeImageToSavedPhotosAlbum:[image CGImage] orientation:(ALAssetOrientation)[image imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){
if (error) {
// TODO: error handlin...
Defining a HTML template to append using JQuery
...
</a>
</script>
On document load, read your template and tokenize it using a simple String#split
var itemTpl = $('script[data-template="listitem"]').text().split(/\$\{(.+?)\}/g);
Notice that with our token, you get it in the alternating [text, property, text, property] format. T...