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[since C++11] std::array的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...数组也可以像Java等语言那样知道自己的length；它提供了begin(), end()等接口使得“数组”也可以和STL血脉相容；它还提供了tuple接口，可以当做tuple来使用；更重要的一点是，array有并不比原生数组差的性能表现。
array的概念
array...
Convert character to ASCII numeric value in java
I have String name = "admin";
then I do String charValue = name.substring(0,1); //charValue="a"
22 Answers
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How do I get the result of a command in a variable in windows?
I'm looking to get the result of a command as a variable in a Windows batch script (see how to get the result of a command in bash for the bash scripting equivalent). A solution that will work in a .bat file is preferred, but other common windows scripting solutions are also welcome.
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how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
...If it doesn't modify any row that means it didn't exist, so do an insert. Obviously, you do this inside a transaction.
You can of course wrap this in a function if you don't want to put the extra code on the client side. You also need a loop for the very rare race condition in that thinking.
Ther...
Python division
I was trying to normalize a set of numbers from -100 to 0 to a range of 10-100 and was having problems only to notice that even with no variables at all, this does not evaluate the way I would expect it to:
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What's the most elegant way to cap a number to a segment? [closed]
Let's say x , a and b are numbers. I need to cap x to the bounds of the segment [a, b] .
10 Answers
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mysql update column with value from another table
I have two tables, both looking like
8 Answers
8
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Adding 'serial' to existing column in Postgres
I have a small table (~30 rows) in my Postgres 9.0 database with an integer ID field (the primary key) which currently contains unique sequential integers starting at 1, but which was not created using the 'serial' keyword.
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method overloading vs optional parameter in C# 4.0 [duplicate]
which one is better? at a glance optional parameter seems better (less code, less XML documentation, etc), but why do most MSDN library classes use overloading instead of optional parameters?
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What's the difference between eval, exec, and compile?
I've been looking at dynamic evaluation of Python code, and come across the eval() and compile() functions, and the exec statement.
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