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How do I detect unsigned integer multiply overflow?
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Some compilers provide access to the integer overflow flag in the CPU which you could then test but this isn't standard.
You could also test for the possibility of overflow before you perform the multiplication:
if ( b > ULONG_MAX / a ) // a * b would overflow
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linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...也可以解决多用户需要同时访问外网但公有IP地址不足的问题。同时可以作为一个防火墙，隔离内网与外网，并且能提供监控网络和记录传输信息的功能，加强局域网的安全性等。它的主要作用有以下几点。
1．共享网络
2．...
Why is there no xrange function in Python3?
... but every time i use range i hear that huge distressing fan sound meaning cpu is on it's worst, while xrange doesn't do it. Think you about it ;)
– catalesia
Feb 22 '13 at 0:16
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Scalar vs. primitive data type - are they the same thing?
...ar processor' in contrast to a 'vector processor'. A scalar processor is a CPU that can only handle one piece of data at a time. These processors were/are named after the arithmetic terms. Interestingly enough, when you look up 'scalar' on wikipedia, you get redirected to 'variable'.
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How do I execute a command and get the output of the command within C++ using POSIX?
...ed ;)
{
// Give some timeslice (50 ms), so we won't waste 100% CPU.
bProcessEnded = WaitForSingleObject( pi.hProcess, 50) == WAIT_OBJECT_0;
// Even if process exited - we continue reading, if
// there is some data available over pipe.
for (;;)
{
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Advantages to Using Private Static Methods
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Passing an extra parameter means the CPU has to do extra work to place that parameter in a register, and push it onto the stack if the instance method calls out to another method.
– Kent Boogaart
Sep 25 '08 at 18:33
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PHP foreach change original array values
...est your specific scenario and determine which option uses less memory and CPU time. For more information see the SO post linked below by NikiC.
Code readability.
Creating references in PHP is something that quickly gets out of hand. If you are a novice and don't have full control of what you are d...
What is the best algorithm for overriding GetHashCode?
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Incidentally, 31 is a shift and subtract on the CPU, which is exceedingly fast.
– Chui Tey
Aug 22 '13 at 23:14
4
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Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
...lation unit (for example: a foreign library, a file on disc, network data, CPU page tables, ...). In such a case the binary structure of data is also defined in a place inaccessible to the compiler, so reordering the struct fields would create a data type that is inconsistent with the other definiti...
Why does JPA have a @Transient annotation?
...field will still get serialized!
Suppose you create a entity, doing some CPU-consuming calculation to get a result and this result will not save in database. But you want to sent the entity to other Java applications to use by JMS, then you should use @Transient, not the JavaSE keyword transient. ...