大约有 3,800 项符合查询结果（耗时：0.0294秒） [XML]
How efficient is locking an unlocked mutex? What is the cost of a mutex?
...
123
I have the choice in between either having a bunch of mutexes or a single one for an object...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...cked__)) my_struct {
char c;
int i;
};
struct my_struct a = {'a', 123};
struct my_struct *b = &a;
int c = a.i;
int d = b->i;
int *e __attribute__((aligned(1))) = &a.i;
int *f = &a.i;
Here, the type of a is a packed struct (as defined above). Similarly, b is a pointer to a p...
How are virtual functions and vtable implemented?
...
123
How are virtual functions implemented at a deep level?
From "Virtual Functions in C++":
W...
Why is “while ( !feof (file) )” always wrong?
...tespace. Using C++ iostreams, it goes like this:
std::string input = " 123 "; // example
std::istringstream iss(input);
int value;
if (iss >> value >> std::ws && iss.get() == EOF) {
consume(value);
} else {
// error, "input" is not parsable as an inte...
File I/O in Every Programming Language [closed]
...but I did the best I could. Let the downvoting begin! :) I still find it a fun exercise.
HAI
CAN HAS STDIO?
PLZ OPEN FILE "FILEIO.TXT" ITZ "TehFilez"?
AWSUM THX
BTW #There is no standard way to output to files yet...
VISIBLE "Hello" ON TehFilez
BTW #There isn't a standard...
NOT using repository pattern, use the ORM as is (EF)
...gration to another DB technology or b) you're choosing a DB technology for fun or c) something has gone horribly wrong with the first technology you decided to use.
Why throw away the rich LINQ syntax?
LINQ and EF were developed so you could do neat stuff with it to read and traverse object graphs...
Why are Subjects not recommended in .NET Reactive Extensions?
...sage2(), and message3() as messages are generated. It seems like messageX[123] would call OnNext on a subject, but is there a better way?
– James Moore
Apr 11 '16 at 17:18
1
...
Why does the C preprocessor interpret the word “linux” as the constant “1”?
...d unix macro:
main() { printf(&unix["\021%six\012\0"],(unix)["have"]+"fun"-0x60);}
It prints "unix", but for reasons that have absolutely nothing to do with the spelling of the macro name.
share
|
...
Is volatile expensive?
...
123
On Intel an un-contended volatile read is quite cheap. If we consider the following simple ca...
Seeking clarification on apparent contradictions regarding weakly typed languages
...f these things at the same time. So you can, for example, write:
$foo = "123" + "456"; # $foo = 579
$bar = substr($foo, 2, 1); # $bar = 9
$bar .= " lives"; # $bar = "9 lives"
$foo -= $bar; # $foo = 579 - 9 = 570
Of course, as you correctly note, all...