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How to calculate the angle between a line and the horizontal axis?
...xtend infinitely and don't start at a particular point).
deltaY = P2_y - P1_y
deltaX = P2_x - P1_x
Then calculate the angle (which runs from the positive X axis at P1 to the positive Y axis at P1).
angleInDegrees = arctan(deltaY / deltaX) * 180 / PI
But arctan may not be ideal, because dividin...
google mock分享（全网最全最好的gmock文档，没有之一） - C/C++ - 清泛网 ...
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FooInterface的析构函数~FooInterface()必须是virtual的
在第13行，我们得把getArbitraryString定义为纯虚函数。其实getArbitraryString()也不一定得是纯虚函数，这点我们后面会提到.
现在我们用Google Mock来定义Mock类 FooMock.h
#ifndef MO...
How to debug Lock wait timeout exceeded on MySQL?
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11 Answers
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Which SQL query is faster? Filter on Join criteria or Where clause?
...LEFT JOIN
TableXRef x
ON x.TableAID = a.ID
AND a.ID = 1
LEFT JOIN
TableB b
ON x.TableBID = b.ID
or this:
SELECT *
FROM TableA a
LEFT JOIN
TableXRef x
ON x.TableAID = a.ID
LEFT JOIN
TableB b
ON b.id = x.TableBID
WHERE a.id = 1
The...
Finding current executable's path without /proc/self/exe
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13 Answers
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Extract first item of each sublist
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201
Using list comprehension:
>>> lst = [['a','b','c'], [1,2,3], ['x','y','z']]
>>&g...
How can I convert a DateTime to the number of seconds since 1970?
...t a C# DateTime variable to Unix time, ie, the number of seconds since Jan 1st, 1970. It looks like a DateTime is actually implemented as the number of 'ticks' since Jan 1st, 0001.
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Generating random whole numbers in JavaScript in a specific range?
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What are the main uses of yield(), and how does it differ from join() and interrupt()?
...ifferent from a non-zero sleep where the sleeping thread
generally loses 1 quantum value (in effect, 1/3 of a 10 or 15ms tick).
In Java 6, this behaviour was changed. The Hotspot VM now implements
Thread.yield() using the Windows SwitchToThread() API call. This call
makes the current thre...