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Floating point vs integer calculations on modern hardware
...;
# else
struct timeval tv;
if(gettimeofday(&tv, 0) < 0) {
perror("oops");
}
return (double)tv.tv_sec + (0.000001 * (double)tv.tv_usec);
# endif
}
template< typename Type >
void my_test(const char* name) {
Type v = 0;
// Do not use constants or repeating values
// t...
std::wstring VS std::string
...ut << "wtext : " << wtext << std::endl ; <- error
std::cout << "wtext : UNABLE TO CONVERT NATIVELY." << std::endl ;
std::wcout << L"wtext : " << wtext << std::endl;
std::cout << "sizeof(wtext) : " <...
Does the C++ standard mandate poor performance for iostreams, or am I just dealing with a poor imple
...mmon misconception - vector[] operator is typically NOT checked for bounds errors by default. vector.at() is however.
– Roddy
Dec 2 '10 at 22:56
...
When to Redis? When to MongoDB? [closed]
...The largest need is usually data model, as that determines how complex and error-prone your code is. Specialized applications will lean on performance, places where you write everything in a mixture of C and Assembly; most applications will just handle the generalized case and use a caching system ...
What are the differences between local branch, local tracking branch, remote branch and remote track
...to use. If the branch is not set up to track another branch, you'll get an error like this one:
$ git checkout new-feature
$ git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details
git pull <remote>...
Peak signal detection in realtime timeseries data
...eshold that makes the algorithm signal when you want it to (some trial-and-error might be needed here to get to a good threshold for your purpose).
WARNING: The code above always loops over all datapoints everytime it runs. When implementing this code, make sure to split the calculation of the sign...
How to avoid reverse engineering of an APK file?
...e to work to come up with an equation that won't lose currency to rounding errors etc.
You can do a similar thing for server side tasks. Now for an example, let's actually take your payment processing app. Let's say the user has to make a payment of $200. Instead of sending a raw $200 value to the s...
boost::flat_map and its performance compared to map and unordered_map
...ove the overhead of the measurer itself.
u64 g_accuracy;
static u64 const errormeasure = ~((u64)0);
#ifdef _MSC_VER
#pragma intrinsic(__rdtsc)
inline u64 GetRDTSC()
{
int a[4];
__cpuid(a, 0x80000000); // flush OOO instruction pipeline
return __rdtsc();
}
inline void WarmupRDTSC()
{
...
How should a model be structured in MVC? [closed]
...Identification $exception) {
$data = [
'status' => 'error',
'message' => 'Login failed!',
]
}
return new JsonResponse($data);
}
While this is not sustainable, when you have complicate logic for rendering a response body, this simplification is...
Separation of business logic and data access in django
... if User.objects.get(pk=user_id).active:
raise ValidationError("This user cannot be activated")
# you can also check authorizations etc.
return user_id
def execute(self):
"""
This is not a standard method in the forms API; it is intended to rep...