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c++ Programming Glossary: divmodular arithmetics and NTT (finite field DFT) optimizations http://stackoverflow.com/questions/18577076/modular-arithmetics-and-ntt-finite-field-dft-optimizations eax _a mov ebx _b mul ebx H edx L eax eax ebx mov ebx _p div ebx eax H edx L eax ebx mov _a edx edx H edx L eax ebx return..
Would you use num%2 or num&1 to check if a number is even? http://stackoverflow.com/questions/1949271/would-you-use-num2-or-num1-to-check-if-a-number-is-even the logial and here are far more efficient than a mod or div operation. Of course you may argue that some compilers will..
Brute-force, single-threaded prime factorization http://stackoverflow.com/questions/3918968/brute-force-single-threaded-prime-factorization thumb. Therefore a sieve will spend 5 times less time on div operations as your skip filter. The next factor to consider.. memory or disk. If fetching one prime is faster than 4 div s then the sieve is faster. According to my tables div throughput.. 4 div s then the sieve is faster. According to my tables div throughput on my Core2 is at most one per 12 cycles. These will..
Boost::Tuples vs Structs for return values http://stackoverflow.com/questions/409827/boosttuples-vs-structs-for-return-values terminally lazy. Borrowing an example I'd use this struct divide_result int quotient int remainder Using a tuple you'd have.. Using a tuple you'd have typedef boost tuple int int divide_result But without reading the code of the function you're.. is quotient and vice versa. It seems rather like... struct divide_result int results 2 0 is quotient 1 is remainder I think..
How do I catch system-level exceptions in Linux C++? http://stackoverflow.com/questions/618215/how-do-i-catch-system-level-exceptions-in-linux-c man 1 gcc there is a compiler option mcheck zero division to handle this. Alternatively installing a SIGFPE handler.. installing a SIGFPE handler might be an option A float div by 0 would then generate a 'FPE_ZERODIVIDE' signal SIGFPE fptr.. point systems are based on the IEEE standard which allows division by 0. This returns either positive infinity or negative..
How to write a regular expression for html parsing? http://stackoverflow.com/questions/792679/how-to-write-a-regular-expression-for-html-parsing I want to match a html tag with given attribute eg. div with class tab news selected that contains one or more a href.. a href tags. The regexp should match the entire tag from div to div . I always seem to get memory exhausted errors my program.. tags. The regexp should match the entire tag from div to div . I always seem to get memory exhausted errors my program probably..
Boost::Spirit Expression Parser http://stackoverflow.com/questions/8464969/boostspirit-expression-parser mul _1 _2 expr ' ' expr _val construct ast binary_op ast div _1 _2 expr number varname binop qi rule Iterator ast expression.. ast mul _1 _2 ' ' expr _val construct ast binary_op ast div _1 _2 But now it's of course not able to build the AST because.. ast sub left right case ' ' return ast binary_op ast div left right case ' ' return ast binary_op ast mul left right..
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