大约有 2,193 项符合查询结果（耗时：0.0098秒） [XML]
EXC_BAD_ACCESS signal received
...s - unless you make a big point of it.
Remember, anything you get from an allocation function (usually the static alloc method, but there are a few others), or a copy method, you own the memory too and must release it when you are done.
But if you get something back from just about anything else i...
What is The Rule of Three?
... executing the body of the destructor and destroying any automatic objects allocated within the body,
a destructor for class X calls the destructors for X's direct [...] members
[n3126.pdf 12.4 §6]
Managing resources
So when should we declare those special member functions explicitly?
When our cla...
What are the differences between virtual memory and physical memory?
...d on demand, which may remove the need for linked structures, as well as reallocation.
– awdz9nld
Jan 19 '15 at 21:40
...
AES Encryption for an NSString on the iPhone
... const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSString *key = @"my password";
NSString *secret = @"text to encrypt";
NSData *plain = [secret dataUsingEncoding:NSUTF8StringEncoding];
NSData *cipher = [plain AES256EncryptWithKey:key];
pr...
Bytes of a string in Java
...
I was assuming the question was about the number of bytes allocated in memory for a String object. If the question is about the number of bytes required to serialize the String, as others have pointed out, it depends on the encoding used.
– roozbeh
...
Convert NSArray to NSString in Objective-C
...iption message on each item:
NSMutableString * result = [[NSMutableString alloc] init];
for (NSObject * obj in array)
{
[result appendString:[obj description]];
}
NSLog(@"The concatenated string is %@", result);
Another approach would be to do something based on each item's class:
NSMutableS...
What is the difference between “instantiated” and “initialized”?
...ble is initialized with a value. An object is instantiated when memory is allocated for it and it's constructor has been run.
For instance here is a variable:
Dim obj as Object
This variable has not been initialized. Once I assign a value to the obj variable, the variable will be initialized. ...
std::string to char*
..., then because I want to call C code which changes the string and C code deallocates stuff with free() and allocates with malloc() (strdup uses malloc). So if I pass my raw string to some function X written in C it might have a constraint on it's argument that it has to allocated on the heap (for ex...
How to get IntPtr from byte[] in C#
...th unmanaged code by using Mashal.Copy:
IntPtr unmanagedPointer = Marshal.AllocHGlobal(bytes.Length);
Marshal.Copy(bytes, 0, unmanagedPointer, bytes.Length);
// Call unmanaged code
Marshal.FreeHGlobal(unmanagedPointer);
Alternatively you could declare a struct with one property and then use Marsh...
Technically, why are processes in Erlang more efficient than OS threads?
... registers, address space mapping, etc.).
Erlang processes use dynamically allocated stacks, which start very small and grow as necessary. This permits the spawning of many thousands — even millions — of Erlang processes without sucking up all available RAM.
Erlang used to be single-threaded, me...