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How to Calculate Execution Time of a Code Snippet in C++
...HighDateTime;
uint64 ret = li.QuadPart;
ret -= 116444736000000000LL; /* Convert from file time to UNIX epoch time. */
ret /= 10000; /* From 100 nano seconds (10^-7) to 1 millisecond (10^-3) intervals */
return ret;
#else
/* Linux */
struct timeval tv;
gettimeofday(&tv, NULL);
uint64 ...
Storing Objects in HTML5 localStorage
...vaScript object in HTML5 localStorage , but my object is apparently being converted to a string.
22 Answers
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data.frame rows to a list
I have a data.frame which I would like to convert to a list by rows, meaning each row would correspond to its own list elements. In other words, I would like a list that is as long as the data.frame has rows.
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error opening HPROF file: IOException: Unknown HPROF Version
...he hprof file you get from Android has android specific format. You should convert hprof file take from Android OS into standard hprof format. For this you can use hprof-conv tool that is located at AndroidSDK/tools/hprof-conv.
For example:
hprof-conv android.hprof mat.hprof
And then open mat.h...
Where did the name `atoi` come from?
In the C language where did they come up with the name atoi for converting a string to an integer? The only thing I can think of is Array To Integer for an acronym but that doesn't really make sense.
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How do I get a value of datetime.today() in Python that is “timezone aware”?
...you are in UTC time to begin with. Always use timezone aware based on UTC. convert to local timezone on output when needed.
– MrE
Sep 13 '17 at 18:36
4
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Why doesn't c++ have &&= or ||= for booleans?
...different value such as 2. When assigning that value to a bool, it will be converted to true as per the standard.
The only way to get an invalid value into a bool is by using reinterpret_cast on pointers:
int i = 2;
bool b = *reinterpret_cast<bool*>(&i);
b |= true; // MAY yield 3 (but do...
How can I change a secret Gist to public?
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You have to know that you cannot convert your public Gist into a secret Gist (only Public -> Secret). See help.github.com/articles/creating-gists/#creating-a-gist
– GiDo
Jul 5 '16 at 15:45
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How can I output the value of an enum class in C++11
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Unlike an unscoped enumeration, a scoped enumeration is not implicitly convertible to its integer value. You need to explicitly convert it to an integer using a cast:
std::cout << static_cast<std::underlying_type<A>::type>(a) << std::endl;
You may want to encapsulate ...
How to avoid warning when introducing NAs by coercion
...but I don't know how to avoid getting a warning when using as.numeric to convert a character vector.
4 Answers
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