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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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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 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
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How to set selected value of jquery select2?
This belong to codes prior to select2 version 4
28 Answers
28
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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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View.setPadding accepts only in px, is there anyway to setPadding in dp?
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This is the formula for Converting dp units to pixel units. You can use it anywhere
– Labeeb Panampullan
Jul 11 '11 at 7:42
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How to JSON serialize sets?
...ut then you would be giving up some other structure you might need (if you convert sets to a list, then you lose the ability to recover regular lists; if you convert sets to a dictionary using dict.fromkeys(s) then you lose the ability to recover dictionaries).
A more sophisticated solution is to b...
Callback functions in C++
...nter to member function since different types can be passed and implicitly converted into a std::function object.
3.3.1 Function pointers and pointers to member functions
A function pointer
int a = 2;
int b = stdf_foobar(a, &foo);
// b == 6 ( 2 + (2+2) )
or a pointer to member function
int...
Why does “,,,” == Array(4) in Javascript?
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Because the right hand operand is converted to a string and the string representation of Array(4) is ,,,:
> Array(4).toString()
",,,"
If you use the array constructor function and pass a number, it sets the length of the array to that number. So you ...