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Compile time string hashing
...l over std::hash's algorithm, and we must reimplement it as a constexpr in order to evaluate it at compile time. In addition, there are no "transparent" hashes in std, so you cannot (without creating a std::string) hash a raw character buffer as a std::string.
I stuck the std::string custom hasher...
Why do we need C Unions?
... follows:
reg.dword = 0x12345678;
reg.bytes.byte3 = 4;
Endianness (byte order) and processor architecture are of course important.
Another useful feature is the bit modifier:
typedef union
{
struct {
unsigned char b1:1;
unsigned char b2:1;
unsigned char b3:1;
...
How does libuv compare to Boost/ASIO?
...o allows for applications to provide custom memory allocation functions in order to implement a memory allocation strategy for handlers.
Maturity
Boost.Asio
Asio's development dates back to at least OCT-2004, and it was accepted into Boost 1.35 on 22-MAR-2006 after undergoing a 20-day peer revi...
ElasticSearch - Return Unique Values
...ed my answer with an example result. You can/should also set "size": 0, in order to not include any of the documents, only the aggregated results you wanted.
– Anton
Aug 24 '14 at 12:15
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MongoDb query condition on comparing 2 fields
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Stretch and scale a CSS image in the background - with CSS only
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CSS3 has a nice little attribute called background-size:cover.
This scales the image so that the background area is completely covered by the background image while maintaining the aspect ratio. The entire area will be covered. However, part of the image may...
Is there an alternative sleep function in C to milliseconds?
...ep() takes microseconds, so you will have to multiply the input by 1000 in order to sleep in milliseconds.
usleep() has since been deprecated and subsequently removed from POSIX; for new code, nanosleep() is preferred:
#include <time.h>
int nanosleep(const struct timespec *req, str...
On Duplicate Key Update same as insert
...real life query there are differences. My question is quiet simple: Do I really need to specify all the fields (and values in my first example) if they are the same as in the insert? I just want to insert all or if there is a unique value match: update all.
– Roy
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What's the best practice for putting multiple projects in a git repository? [closed]
...olution 1
A single repository can contain multiple independent branches, called orphan branches. Orphan branches are completely separate from each other; they do not share histories.
git checkout --orphan BRANCHNAME
This creates a new branch, unrelated to your current branch. Each project should...
Post-install script with Python setuptools
... the reason why the dependencies are not handled anymore). In addition, in order to know the install directory, I've put _post_install() as a method of new_install, what lets me access to self.install_purelib and self.install_platlib (don't know which one to use, but self.install_lib is wrong, weird...