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How do I implement an Objective-C singleton that is compatible with ARC?
...n;
dispatch_once(&onceToken, ^{
sharedInstance = [[MyClass alloc] init];
// Do any other initialisation stuff here
});
return sharedInstance;
}
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Java lib or app to convert CSV to XML file? [closed]
....append(lineBreak);
while ((line = reader.readLine()) != null) {
StringTokenizer tokenizer = new StringTokenizer(line, ",");
if (isHeader) {
isHeader = false;
while (tokenizer.hasMoreTokens()) {
headers.add(tokenizer.nextToken());
}
} else {
co...
xtree(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false...
...s<std::string,CPTCensorStatusItem *,CGraphFrame::Compare<std::string>,std::allocator<std::pair<const std::string,CPTCensorStatusItem *>>,false>,
1> _Kty=std::string,
1> _Ty=CPTCensorStatusItem *,
1> _Nodety=std::_Tree_node<std::pair<const std::string,CPTCens...
What is the most efficient way to store a list in the Django models?
...models.SubfieldBase
def __init__(self, *args, **kwargs):
self.token = kwargs.pop('token', ',')
super(SeparatedValuesField, self).__init__(*args, **kwargs)
def to_python(self, value):
if not value: return
if isinstance(value, list):
return value
...
Do HttpClient and HttpClientHandler have to be disposed between requests?
...esources. HttpClient is no exception, since as Darrel Miller points out it allocates cancellation tokens, and request/response bodies can be unmanaged streams.
However, the best practice for HttpClient says you should create one instance and reuse it as much as possible (using its thread-safe member...
AngularJS- Login and Authentication in each route and controller
...ge of requesting the server, to know the user profile (linked to an access token attached to the request for example):
.service("Auth", ["$http", function ($http) {
this.getProfile = function () {
return $http.get("api/auth");
};
}])
The server is expected to return such a JSON object w...
How can I convert an image into a Base64 string?
...util.Log;
// You probably don't want to do this with large files
// (will allocate a large string and can cause an OOM crash).
private String readFileAsBase64String(String path) {
try {
InputStream is = new FileInputStream(path);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
...
Performance surprise with “as” and nullable types
...e a new Nullable<T> on the heap and compute the address to the newly allocated object.
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Error: free(): invalid next size (fast):
... you have a memory error. You may be trying to free a pointer that wasn't allocated by malloc (or delete an object that wasn't created by new) or you may be trying to free/delete such an object more than once. You may be overflowing a buffer or otherwise writing to memory to which you shouldn't be...
Stack vs heap allocation of structs in Go, and how they relate to garbage collection
...le stack-based programming where automatic variables live on the stack and allocated memory lives on the heap and and Python-style stack-based-programming where the only thing that lives on the stack are references/pointers to objects on the heap.
...