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How dangerous is it to compare floating point values?
...at's not a perfect square.
Double rounding. On some systems (particularly x86), floating point expressions are evaluated in higher precision than their nominal types. This means that when one of the above types of rounding happens, you'll get two rounding steps, first a rounding of the result to the...
C++ IDE for Linux? [closed]
...
86
votes
My personal favorite is the CodeLite 2.x IDE.
see: http://www.codelite.org
...
How do emulators work and how are they written? [closed]
...r processors using very elegant object oriented programs. For example, an X86 processor would need something to maintain the state of registers (easy), something to maintain the state of memory (easy), and something that would take each incoming command and apply it to the current state of the machi...
Fastest hash for non-cryptographic uses?
...g;
}
?>
And the output
1 - crc32b 0.111036300659
2 - crc32 0.112048864365
3 - md4 0.120795726776
4 - md5 0.138875722885
5 - sha1 0.146368741989
6 - adler32 0.15501332283
7 - tiger192,3 0.177447080612
8 - tiger160,3 0.179498195648
9 - tiger128,3 0.184012889862
10 - ripemd128 0.184052705765
11...
Understanding the Event Loop
...
86
1: If we are talking about a single-threaded application, then what processes setTimeouts wh...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...)
0.217 sec (2.17us/itn) - [i for i in old_list] (a list comprehension)
0.186 sec (1.86us/itn) - copy.copy(old_list)
0.075 sec (0.75us/itn) - list(old_list)
0.053 sec (0.53us/itn) - new_list = []; new_list.extend(old_list)
0.039 sec (0.39us/itn) - old_list[:] (list slicing)
So the fastest is list ...
What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?
...it's not going to be faster than one cycle. Now, although it is not so on x86/amd64, 32-bit integers may not be even addressable. In such a case working on them requires additional ops to extract the 32-bits from, say, 64-bit aligned units. See also the linked question. C++ standard is written so th...
STL or Qt containers?
... 1 byte. E.g. the largest .size() I could have of QVector<float> on x86_64 Linux gcc was 536870907 elements (2²⁹-5), while std::vector<float> successfully allocated 4294967295 elements (2³²-1; didn't try more due to lack of RAM for this (this size already takes 16 GiB)).
...
Is gcc 4.8 or earlier buggy about regular expressions?
....
$ clang --version
clang version 3.9.0 (tags/RELEASE_390/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
$ ./a.out # compiled with 'clang -lstdc++'
<regex> works, look: true
Here be Dragons
This is totally unsupported and relies on the detection of pr...
List of Delphi language features and version in which they were introduced/deprecated
... necessarily do this)
Eight new DEFINEs have been added:
ALIGN_STACK
CPUX86
CPUX64
MACOS (Mac operating system)
MACOS32
PC_MAPPED_EXCEPTIONS
PIC
WIN64
Full unit scope names are now required in your uses clause.
{$ExcessPrecision on/off} compiler directive (x64 only)
The build-in types differ de...