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MQTT 之保留消息（Retained Messages） - 创客硬件开发 - 清泛IT社区，为创新赋能！
保留消息定义 如果PUBLISH消息的RETAIN标记位被设置为1，则称该消息为“保留消息”；Broker对保留消息的处理 Broker会存储每个Topic的最后一条保留消息及其Qos，当订阅该Topic的客户端上线后，Broker需要将该消息投递给它。引...
Why does Math.Round(2.5) return 2 instead of 3?
...ng)
Java Math.Round rounds away from zero (it floors the result, adds 0.5, casts to an integer). There's an alternative in BigDecimal
Perl uses a similar way to C
Javascript is the same as Java's Math.Round.
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Retain precision with double in Java
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Guess it's not really necessary but it avoids casting in the toDouble function so the code reads better.
– Viral Shah
Mar 18 '10 at 4:09
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Are Javascript arrays sparse?
...ot use, neither use thou non-integers, excepting that thou then proceed to cast to String. Arbitrary objects are right out.
– Crescent Fresh
Oct 2 '09 at 18:37
8
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What's the best way to trim std::string?
...ctually a second definition which supports locales. This could have been a cast just the same, but I tend to like this better.
EDIT: To address some comments about accepting a parameter by reference, modifying and returning it. I Agree. An implementation that I would likely prefer would be two sets ...
returning a Void object
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If you want to return null as void you need to cast it in some cases: (Void) null
– Patrick Favre
Mar 29 '16 at 10:04
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Generate class from database table
... Nice answer, but you need to change print @Result to print CAST(@Result AS TEXT) otherwise it gets truncated on large tables.
– Robert McKee
Sep 12 '16 at 18:35
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Is it possible to dynamically compile and execute C# code fragments?
... select i;
}
}");
results.Errors.Cast<CompilerError>().ToList().ForEach(error => Console.WriteLine(error.ErrorText));
}
}
The class of primary importance here is the CSharpCodeProvider which utilises the compiler to compile code on the fly. If...
Why is Spring's ApplicationContext.getBean considered bad?
I asked a general Spring question: Auto-cast Spring Beans and had multiple people respond that calling Spring's ApplicationContext.getBean() should be avoided as much as possible. Why is that?
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How to drop columns by name in a data frame
...is not needed for a one column dataframe (because df['myColumns'] will get casted to a vector if needed).
– Antoine Lizée
Aug 3 '15 at 18:08
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