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Declaration of Methods should be Compatible with Parent Methods in PHP
...ls which may fail at run-time. Suppose you have
class A { public function foo($a = 1) {;}}
class B extends A { public function foo($a) {;}}
function bar(A $a) {$a->foo();}
The compiler only checks the call $a->foo() against the requirements of A::foo() which requires no parameters. $a may h...
How does the Comma Operator work
...n whatsoever if it does not affect the final result (e.g. false && foo() will skip the call to foo). This is however not the case for comma operator and the above steps will always happen*.
In practice, the default comma operator works almost the same way as a semicolon. The difference is t...
Why does this async action hang?
...nd a common mistake with the TPL, so don't feel bad.
When you write await foo, the runtime, by default, schedules the continuation of the function on the same SynchronizationContext that the method started on. In English, let's say you called your ExecuteAsync from the UI thread. Your query runs on...
How to get the request parameters in Symfony 2?
...Foundation\Request;
public function updateAction(Request $request)
{
$foo = $request->get('foo');
$bar = $request->get('bar');
}
Another option is to introduce your parameters into your action function definition:
use Symfony\Component\HttpFoundation\Request;
public function updat...
What is monkey patching?
...monkey-patching in the Pandas documentation:
import pandas as pd
def just_foo_cols(self):
"""Get a list of column names containing the string 'foo'
"""
return [x for x in self.columns if 'foo' in x]
pd.DataFrame.just_foo_cols = just_foo_cols # monkey-patch the DataFrame class
df = pd....
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
...lude <stdio.h>
#include <stddef.h>
int main(void)
{
struct foo {
char c;
int x;
} __attribute__((packed));
struct foo arr[2] = { { 'a', 10 }, {'b', 20 } };
int *p0 = &arr[0].x;
int *p1 = &arr[1].x;
printf("sizeof(struct foo) = %d\n", (...
家政O2O百家争鸣后的卡位战：烧钱补贴并非良药 - 资讯 - 清泛网移动版 - 专...
...慢慢留下来，差的阿姨逐渐被淘汰的优胜劣汰过程，不过这个过程需要一定时间。
烧钱补贴并非良药
无论是国内还是国外，烧钱已经成为企业撬动市场最快的方式，但家政O2O鼻祖Homejoy倒下的案例有力地证明了烧钱之道并非良...
How does the C code that prints from 1 to 1000 without loops or conditional statements work?
...
foo(arg) and (&foo)(arg) are equivalent, they call foo with argument arg. newty.de/fpt/fpt.html is an interesting page about function pointers.
– Mat
Oct 29 '11 at 8:57
...
How do I use a custom deleter with a std::unique_ptr member?
...signatures:
Bar* create();
void destroy(Bar*);
You can write your class Foo like this
class Foo {
std::unique_ptr<Bar, void(*)(Bar*)> ptr_;
// ...
public:
Foo() : ptr_(create(), destroy) { /* ... */ }
// ...
};
Notice that you don't need to write any lambda or custom...
Convert list to array in Java [duplicate]
...
Either:
Foo[] array = list.toArray(new Foo[0]);
or:
Foo[] array = new Foo[list.size()];
list.toArray(array); // fill the array
Note that this works only for arrays of reference types. For arrays of primitive types, use the tra...