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What is uintptr_t data type
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Another common use case of casting a pointer to an int is to create an opaque handle that hides the pointer. This is useful for returning a reference to an object from APIs where you want to keep the object private to the library and prevent applicati...
How do I specify a pointer to an overloaded function?
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You can use static_cast<>() to specify which f to use according to the function signature implied by the function pointer type:
// Uses the void f(char c); overload
std::for_each(s.begin(), s.end(), static_cast<void (*)(char)>(&...
Connecting overloaded signals and slots in Qt 5
...For Qt 5.6 and earlier, you need to tell Qt which one you want to pick, by casting it to the right type:
connect(spinbox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged),
slider, &QSlider::setValue);
I know, it's ugly. But there's no way around this. Today's le...
How to compare dates in datetime fields in Postgresql?
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@Nicolai is correct about casting and why the condition is false for any data. i guess you prefer the first form because you want to avoid date manipulation on the input string, correct? you don't need to be afraid:
SELECT *
FROM table
WHERE update...
PHP equivalent of .NET/Java's toString()
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You can use the casting operators:
$myText = (string)$myVar;
There are more details for string casting and conversion in the Strings section of the PHP manual, including special handling for booleans and nulls.
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ArrayList vs List in C#
... is a generic class. It supports storing values of a specific type without casting to or from object (which would have incurred boxing/unboxing overhead when T is a value type in the ArrayList case). ArrayList simply stores object references. As a generic collection, List<T> implements the gen...
How to create Temp table with SELECT * INTO tempTable FROM CTE Query
...Select EventID, EventStartDate, EventEndDate, PlannedDate as [EventDates], Cast(PlannedDate As datetime) AS DT, Cast(EventStartTime As time) AS ST,Cast(EventEndTime As time) AS ET, EventTitle
,EventType from Calendar
where (PlannedDate >= GETDATE()) AND ',' + EventEnumDays + ',' like '%,' + cast(...
byte + byte = int… why?
...(int) x + (int) y;
So, there is no + operation on bytes, bytes are first cast to integers and the result of addition of two integers is a (32-bit) integer.
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PostgreSQL: How to change PostgreSQL user password?
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This let the clear password in the user's postgresql command history.
– greg
Oct 4 '12 at 7:42
126
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Postgresql GROUP_CONCAT equivalent?
...ROM data_table
GROUP BY id_field
array_agg returns an array, but you can CAST that to text and edit as needed (see clarifications, below).
Prior to version 8.4, you have to define it yourself prior to use:
CREATE AGGREGATE array_agg (anyelement)
(
sfunc = array_append,
stype = anyarray,
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