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What is the curiously recurring template pattern (CRTP)?
...ality<Derived> const & op2)
{
Derived const& d1 = static_cast<Derived const&>(op1);//you assume this works
//because you know that the dynamic type will actually be your template parameter.
//wonderful, isn't it?
Derived const& d2 = static_cast<Der...
How do I print a double value with full precision using cout?
...
The iostreams way is kind of clunky. I prefer using boost::lexical_cast because it calculates the right precision for me. And it's fast, too.
#include <string>
#include <boost/lexical_cast.hpp>
using boost::lexical_cast;
using std::string;
double d = 3.14159265358979;
cout &l...
SQL: IF clause within WHERE clause
...his without any IF or CASE
WHERE
(IsNumeric(@OrderNumber) AND
(CAST OrderNumber AS VARCHAR) = (CAST @OrderNumber AS VARCHAR)
OR
(NOT IsNumeric(@OrderNumber) AND
OrderNumber LIKE ('%' + @OrderNumber))
Depending on the flavour of SQL you may need to tweak the casts on the orde...
Format number to 2 decimal places
...
How about
CAST(2229.999 AS DECIMAL(6,2))
to get a decimal with 2 decimal places
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In what cases do I use malloc and/or new?
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malloc is not typesafe in any meaningful way. In C++ you are required to cast the return from void*. This potentially introduces a lot of problems:
#include <stdlib.h>
struct foo {
double d[5];
};
int main() {
foo *f1 = malloc(1); // error, no cast
foo *f2 = static_cast<foo*>...
Replace a newline in TSQL
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If the column data type is text then you need to cast to nvarchar first then replace SELECT REPLACE(REPLACE(cast(@str as nvarchar(max)), CHAR(13), ''), CHAR(10), '')
– akd
Mar 23 '16 at 10:33
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How to convert / cast long to String?
I just created sample BB app, which can allow to choose the date.
8 Answers
8
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How to calculate age (in years) based on Date of Birth and getDate()
...used this query in our production code for nearly 10 years:
SELECT FLOOR((CAST (GetDate() AS INTEGER) - CAST(Date_of_birth AS INTEGER)) / 365.25) AS Age
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How can I convert String to Int?
...t for noobish people what 'out x' does is set the value of x to the string-cast-as-integer, if the casting is successful. I.e. in this case, x = 0 if the string has any non-integer characters, or x = value of string-as-integer otherwise. So the neat thing is this is one short expression which tells ...
How to convert an array to object in PHP?
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In the simplest case, it's probably sufficient to "cast" the array as an object:
$object = (object) $array;
Another option would be to instantiate a standard class as a variable, and loop through your array while re-assigning the values:
$object = new stdClass();
foreach ...