大约有 2,253 项符合查询结果（耗时：0.0394秒） [XML]
How are virtual functions and vtable implemented?
...more constant table
&vtableFoo, // can dynamic_cast to Foo
(void(*)(Foo*)) destructBar, // must cast type to avoid errors
(int(*)(Foo*)) aBar
};
void constructBar(Bar* self) { // Bar::Bar()
self->base.vtable = &vtableBar; // point to Bar vtable
}
...
Would it be beneficial to begin using instancetype instead of id?
...eclare fileHandleWithStandardOutput as returning an instancetype. Then the cast or assignment isn't necessary.
(Note that on iOS, this example won't produce an error as only NSFileHandle provides a writeData: there. Other examples exist, such as length, which returns a CGFloat from UILayoutSupport ...
Get path of executable
...char> char_vector;
char_vector buf(1024, 0);
uint32_t size = static_cast<uint32_t>(buf.size());
bool havePath = false;
bool shouldContinue = true;
do
{
int result = _NSGetExecutablePath(&buf[0], &size);
if (result == -1)
{
buf.resize(size + 1);
st...
What is the most effective way for float and double comparison?
...
// The mask for the sign bit.
static const Bits kSignBitMask = static_cast<Bits>(1) << (kBitCount - 1);
// The mask for the fraction bits.
static const Bits kFractionBitMask =
~static_cast<Bits>(0) >> (kExponentBitCount + 1);
// The mask for the exponent bits...
Print all day-dates between two dates [duplicate]
...print d
# you can't join dates, so if you want to use join, you need to
# cast to a string in the list comprehension:
ddd = [str(d1 + timedelta(days=x)) for x in range((d2-d1).days + 1)]
# now you can join
print "\n".join(ddd)
...
Generate 'n' unique random numbers within a range [duplicate]
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To shuffle a range in python 3 you first need to cast it to a list: data = list(range(numLow, numHigh)), otherwise you will get an error.
– CheshireCat
Jun 5 '19 at 8:26
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Convert boolean result into number/integer
...
@ESR it casts everything to a number but not always the number you want, if you're dealing with other truthy types. 1 | 0 = 1; 0 | 0 = 0; true | 0 = 1; false | 0 = 0; 'foo' | 0 = 0; undefined | 0 = 0
– Luke Mile...
List to array conversion to use ravel() function
...your (nested, I s'pose?) list, you can do that directly, numpy will do the casting for you:
L = [[1,None,3],["The", "quick", object]]
np.ravel(L)
# array([1, None, 3, 'The', 'quick', <class 'object'>], dtype=object)
Also worth mentioning that you needn't go through numpy at all.
...
Jinja2 template variable if None Object set a default value
...According to docs you can just do:
{{ p|default('', true) }}
Cause None casts to False in boolean context.
Update: As lindes mentioned, it works only for simple data types.
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How do I load an org.w3c.dom.Document from XML in a string?
...
shouldn't there be casting return (Document) builder.parse(new ByteArrayInputStream(xml.getBytes()));??
– InfantPro'Aravind'
Jan 16 '13 at 14:10
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