大约有 30,000 项符合查询结果（耗时：0.0423秒） [XML]
Which is faster : if (bool) or if(int)?
...s an 8-bit value, and your system ABI requires it to "promote" small (< 32-bit) integer arguments to 32-bit when pushing them onto the call stack. So to compare a bool, the compiler generates code to isolate the least significant byte of the 32-bit argument that g receives, and compares it with c...
Get current time as formatted string in Go?
...4:05 MST 2006"
userTimeString := "Fri Dec 6 13:05:05 CET 2019"
t, _ := time.Parse(layout, userTimeString)
fmt.Println("Server: ", t.Format(time.RFC850))
//Server: Friday, 06-Dec-19 13:05:05 CET
mumbai, _ := time.LoadLocation("Asia/Kolkata")
mumbaiTime := t.In(mumbai)
f...
Fastest way to list all primes below N
...on.
Below is a script which compares a number of implementations:
ambi_sieve_plain,
rwh_primes,
rwh_primes1,
rwh_primes2,
sieveOfAtkin,
sieveOfEratosthenes,
sundaram3,
sieve_wheel_30,
ambi_sieve (requires numpy)
primesfrom3to (requires numpy)
primesfrom2to (requires numpy)
Many thanks to...
What is the best way to concatenate two vectors?
...
@boycy No. It is amortized constant time to push_back one element. To push back n elements is O(n)
– Konrad Lindenbach
Mar 12 '16 at 1:47
1
...
CSS background-image - What is the correct usage?
...
answered May 12 '09 at 8:32
GumboGumbo
572k100100 gold badges725725 silver badges804804 bronze badges
...
Send string to stdin
...e3c 59f8 8e3c 0a71 d63c .......<Y..<.q.<
0000010: c6f2 0e3d 3eaa 323d 3a5e 563d 090e 7a3d ...=>.2=:^V=..z=
0000020: 7bdc 8e3d 2aaf a03d b67e b23d c74a c43d {..=*..=.~.=.J.=
0000030: 0513 d63d 16d7 e73d a296 f93d a8a8 053e ...=...=...=...>
0000040: 6583 0e3e 5a5b 173e 5b30 203e 3d0...
Interface defining a constructor signature?
...ialize<GraphicsDeviceManager>, IDrawable
{
GraphicsDeviceManager _graphicsDeviceManager;
public Drawable(GraphicsDeviceManager graphicsDeviceManager)
: base (graphicsDeviceManager)
{
_graphicsDeviceManager = graphicsDeviceManager;
}
public void Update()
...
What is the difference between 'typedef' and 'using' in C++11?
...;
template <typename U> struct bar { typename rebind<U>::type _var_member; }
But using syntax simplifies this use case.
template <typename T> using my_type = whatever<T>;
my_type<int> variable;
template <typename U> struct baz { my_type<U> _var_member; ...
Can C++ code be valid in both C++03 and C++11 but do different things?
...c"
const char* s = u8"def"; // Previously "abcdef", now "def"
and
#define _x "there"
"hello "_x // Previously "hello there", now a user defined string literal
Type conversions of 0
In C++11, only literals are integer null pointer constants:
void f(void *); // #1
void f(...); // #2
template<int ...
Is there a performance difference between i++ and ++i in C++?
... this->data += 1;
return *this;
}
Foo Foo::operator++(int ignored_dummy_value) // called for i++
{
Foo tmp(*this); // variable "tmp" cannot be optimized away by the compiler
++(*this);
return tmp;
}
Since the compiler isn't generating code, but just calling an operator++ ...