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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...
RAII and smart pointers in C++
...e stack. For instance (and stealing an example from another answer):
void foo() {
std::string str;
// Do cool things to or using str
}
This works fine - but what if we want to return str? We could write this:
std::string foo() {
std::string str;
// Do cool things to or using str
...
Catch an exception thrown by an async void method
...ubble up to the calling code - but only if you await or Wait() the call to Foo.
public async Task Foo()
{
var x = await DoSomethingAsync();
}
public async void DoFoo()
{
try
{
await Foo();
}
catch (ProtocolException ex)
{
// The exception will be caught be...
Selecting element by data attribute
...ugin. This allows you to write even more readable code by using .dataAttr('foo'), and results in a smaller file size after minification (compared to using .attr('data-foo')).
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How to write a bash script that takes optional input arguments?
...
You could use the default-value syntax:
somecommand ${1:-foo}
The above will, as described in Bash Reference Manual - 3.5.3 Shell Parameter Expansion [emphasis mine]:
If parameter is unset or null, the expansion of word is substituted. Otherwise, the value of parameter is sub...
How to import module when module name has a '-' dash or hyphen in it?
I want to import foo-bar.py. This works:
5 Answers
5
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Instantiating a generic class in Java [duplicate]
...
Why not pass new Foo() as argument?
– fastcodejava
Mar 12 '10 at 12:04
2
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How can I reliably determine the type of a variable that is declared using var at design time?
... type of a particular expression inside a method body -- say you've typed "foo." and we need to figure out what are the members of foo -- we do the same thing; we skip as much work as we reasonably can.
We start with a pass which analyzes only the local variable declarations within that method. W...
Error message Strict standards: Non-static method should not be called statically in php
...en the respective function or variable should be declared as static
class Foo {
//Static variable
public static $static_var = 'static variable';
//Static function
static function staticValue() { return 'static function'; }
//function
function V...
When to use RSpec let()?
...I prefer this to one large before hook containing all of this. Also, let(:foo) { Foo.new } is less noisy (and more to the point) then before(:each) { @foo = Foo.new }. Here's an example of how I use it: github.com/myronmarston/vcr/blob/v1.7.0/spec/vcr/util/…
– Myron Marston...