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Boost.Asio的简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术
..._time/posix_time/posix_time.hpp>
asio的异步函数会在一个异步操作完成后被回调.这里我们定义了一个将被回调的函数.
void print(const asio::error& /*e*/)
{
std::cout << "Hello, world! ";
}
int main()
{
asio::io_service io;
asio::deadline_timer t...
STL中map容器使用自定义key类型报错详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...象进行了大小比较，但是我们自定义的key类型a并没有对<操作符进行重载，于是报错。
那么map容器和less有什么关系呢，我们的代码怎么回链接到这里了？
看看map的模板定义就知道了：
template<class _Kty,
class _Ty,
class _...
Rename a dictionary key
...n entirely new one using a comprehension.
>>> OrderedDict(zip('123', 'abc'))
OrderedDict([('1', 'a'), ('2', 'b'), ('3', 'c')])
>>> oldkey, newkey = '2', 'potato'
>>> OrderedDict((newkey if k == oldkey else k, v) for k, v in _.viewitems())
OrderedDict([('1', 'a'), ('pota...
How does tuple comparison work in Python?
...
the same thing goes for integers too.
x = (1,2,2) # see it the string "123"
y = (1,2,3)
x > y # False
because (1 is not greater than 1, move to the next, 2 is not greater than 2, move to the next 2 is less than three -lexicographically -)
The key point is mentioned in the answer ab...
How to assign name for a screen? [closed]
...ie Alpert
120k3535 gold badges206206 silver badges231231 bronze badges
answered Jul 8 '10 at 9:29
miedwarmiedwar
7,10011 gold badg...
Replace comma with newline in sed on MacOS?
...
123
sed 's/,/\
/g'
works on Mac OS X.
...
Hidden Features of Visual Studio (2005-2010)?
...
123
votes
Make a selection with ALT pressed - selects a square of text instead of who...
how to read System environment variable in Spring applicationContext
...rop");
For a single property in a @Bean
@Value("${my.another.property:123}") // value after ':' is the default
Integer property;
Another way are the handy @ConfigurationProperties beans:
@ConfigurationProperties(prefix="my.properties.prefix")
public class MyProperties {
// value from my....
EC2 Instance Cloning
...
123
The easier way is through the web management console:
go to the instance
select the instanc...
Display JSON as HTML [closed]
...n't have more upvotes. Simple, easy solution.
– anthv123
Feb 27 '13 at 23:16
9
@geowa4, JSON.stri...