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c++ Programming Glossary: slowWhy is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array a lot of inertia. So they take forever to start up and slow down. Is there a better way You guess which direction the train.. have long pipelines. So they take forever to warm up and slow down . Is there a better way You guess which direction the branch.. unsorted data. In the C case the hack is actually a tad slower than with the branch when the data is sorted. A general rule..
Is there a standard sign function (signum, sgn) in C/C++? http://stackoverflow.com/questions/1903954/is-there-a-standard-sign-function-signum-sgn-in-c-c from integer 0 and orderable. Fast copysign is slow especially if you need to promote and then narrow again. This.. some people think use of a new somewhat esoteric and very slow standard library function that doesn't even really implement..
C++ concatenate string and int http://stackoverflow.com/questions/191757/c-concatenate-string-and-int result name Poco NumberFormatter .format age is safe but slow requires Boost header only most all platforms is safe and fast.. FastFormat which must be compiled most all platforms safe slow and verbose requires nothing is standard C is brittle you must.. fast requires STLSoft header only Windows only is safe but slow requires Poco C most all platforms share improve this answer..
How do exceptions work (behind the scenes) in c++ http://stackoverflow.com/questions/307610/how-do-exceptions-work-behind-the-scenes-in-c scenes in c I keep seeing people say that exceptions are slow but I never see any proof. So instead of asking if they are.. I can make a decisions of when to use them and if they are slow. From what I know exceptions are the same thing as doing a bunch..
What is the copy-and-swap idiom? http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom and copy it . But in all other cases it merely serves to slow the program down and act as noise in the code self assignment..
What can I use to profile C++ code in Linux? http://stackoverflow.com/questions/375913/what-can-i-use-to-profile-c-code-in-linux process of optimizing. What tool can I use to pinpoint my slow code c unix profiling share improve this question If your.. program under the debugger while it's being subjectively slow there's a simple way to find performance problems. Just halt..
http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali with a poor implementation closed Every time I mention slow performance of C standard library iostreams I get met with a.. versions run fewer iterations because they are so much slower. On ideone the ostringstream is about 3 times slower than.. much slower. On ideone the ostringstream is about 3 times slower than std copy back_inserter std vector and about 15 times..
Alternative virtual mechanism implementations? http://stackoverflow.com/questions/4352032/alternative-virtual-mechanism-implementations massive sets of vtables being generated large objects and slow object initialisation. This probably isn't a consequence of..
http://stackoverflow.com/questions/4757565/c-forward-declaration contains a declaration of the function. However this can slow down your compile especially if you #include a header into a..
Can a local variable's memory be accessed outside its scope? http://stackoverflow.com/questions/6441218/can-a-local-variables-memory-be-accessed-outside-its-scope the heap. It doesn't because that would make the program slower. An implementation of C is not required to leave the garbage.. implementations do not actually do that because it is slow and unnecessary. Instead implementations let you make mistakes..
Is pass-by-value a reasonable default in C++11? http://stackoverflow.com/questions/7592630/is-pass-by-value-a-reasonable-default-in-c11 C passing by value into functions and methods is slow for large objects and is generally frowned upon. Instead C programmers..
Why does changing 0.1f to 0 slow down performance by 10x? http://stackoverflow.com/questions/9314534/why-does-changing-0-1f-to-0-slow-down-performance-by-10x does changing 0.1f to 0 slow down performance by 10x Why does this bit of code const float.. floating point can be tens to hundreds of times slower than on normalized floating point. This is because many processors.. _MM_FLUSH_ZERO_ON Then the version with 0 is no longer 10x slower and actually becomes faster. This requires that the code be..
What XML parser should I use in C++? http://stackoverflow.com/questions/9387610/what-xml-parser-should-i-use-in-c as braindead simple to use as XML parsers get. Yes it's slow but it's simple and obvious. It has a lot of convenience functions..
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