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What is the >>>= operator in C?
...s a boolean it's true, so 0xFULL ? '\0' : -1 evaluates to '\0', which is a character literal whose numerical value is simply 0.
Meanwhile, 0X.1P1 is a hexadecimal floating point literal equal to 2/16 = 0.125. In any case, being non-zero, it's also true as a boolean, so negating it twice with !! ag...
throwing exceptions out of a destructor
... ~Bad2()
{
throw 1;
}
};
int main(int argc, char* argv[])
{
try
{
Bad bad;
}
catch(...)
{
std::cout << "Print This\n";
}
try
{
if (argc > 3)
{
Bad bad; // This destructor will thr...
ZMQ: 基本原理 - 开源 & Github - 清泛网移动版 - 专注C/C++及内核技术
...q_connect (s, "tcp://192.168.0.111:5555");
/* Message routing */
const char data [] = "ABC";
zmq_send (s, data, sizeof (data), 0);
区分拓扑建立和消息路由严格地说不是不可缺少的。毕竟，混合这两个为一个单独的函数是很容易的：
zmq_send (s, "tcp://19...
What is the difference between UTF-8 and Unicode?
...n the answers others have given:
We've got lots of languages with lots of characters that computers should ideally display. Unicode assigns each character a unique number, or code point.
Computers deal with such numbers as bytes... skipping a bit of history here and ignoring memory addressing issu...
How do I set a variable to the output of a command in Bash?
...-expanded before being passed to the echo command.
– Charles Duffy
Apr 21 '15 at 15:37
4
...
Composer: how can I install another dependency without updating old ones?
...ck file and any installed packages according to any fuzzy logic (> or * chars after the colons) found in composer.json! This can be avoided by using composer update vendor/package, but I wouldn't recommend making a habit of it, as you're one forgotten argument away from a potentially broken proje...
Is there a performance difference between i++ and ++i in C++?
...ata() { return myData; }
private:
int myData;
};
int main(int argc, char* argv[])
{
Foo testFoo;
int count;
printf("Enter loop count: ");
scanf("%d", &count);
for(int i=0; i<count; i++)
{
testFoo++;
}
printf("Value: %d\n", testFoo.GetData());
...
Is Fortran easier to optimize than C for heavy calculations?
... a double* will not overlap with an int* (with the specific exception that char* and void* can overlap with anything).
If you use them you will get the same speed from C and Fortran. However, the ability to use the restrict keyword only with performance critical functions means that C (and C++) pro...
What is a “callback” in C and how are they implemented?
...ude <string.h>
typedef struct {
int iValue;
int kValue;
char label[6];
} MyData;
int cmpMyData_iValue (MyData *item1, MyData *item2)
{
if (item1->iValue < item2->iValue) return -1;
if (item1->iValue > item2->iValue) return 1;
return 0;
}
int cmpMyDa...
What is the preferred/idiomatic way to insert into a map?
... }
private:
std::vector<double> m_vec;
};
int main(int argc, char* argv[]) {
std::map<int,Widget> map_W;
ptime t1 = boost::posix_time::microsec_clock::local_time();
for(int it = 0; it < 10000;it++) {
map_W.insert(std::pair<int,Widget>(it,Widget...