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Copy constructor for a class with unique_ptr
... unique_ptr can not be shared, you need to either deep-copy its content or convert the unique_ptr to a shared_ptr.
class A
{
std::unique_ptr< int > up_;
public:
A( int i ) : up_( new int( i ) ) {}
A( const A& a ) : up_( new int( *a.up_ ) ) {}
};
int main()
{
A a( 42 );
A ...
How to allocate aligned memory only using the standard library?
...he system — hence questions and answers like this.)
The next step is to convert the void pointer to a char pointer; GCC notwithstanding, you are not supposed to do pointer arithmetic on void pointers (and GCC has warning options to tell you when you abuse it). Then add 16 to the start pointer. ...
Generate an integer that is not among four billion given ones
...lize hardware-supported vector instructions. I think gcc can automatically convert code to using vector operations in some cases though.
– Brian Gordon
Aug 23 '11 at 15:57
3
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What is the Scala identifier “implicitly”?
...ontain a member selection that is applicable to args (even after trying to convert args with Implicit Views). In this case, the compiler looks for implicit members, locally defined in the current or enclosing scopes, inherited, or imported, that are either Functions from the type of that the.prefix ...
typecast string to integer - Postgres
...
If the value contains non-numeric characters, you can convert the value to an integer as follows:
SELECT CASE WHEN <column>~E'^\\d+$' THEN CAST (<column> AS INTEGER) ELSE 0 END FROM table;
The CASE operator checks the < column>, if it matches the integer pat...
Never seen before C++ for loop
I was converting a C++ algorithm to C#.
I came across this for loop:
12 Answers
12
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How to efficiently build a tree from a flat structure?
...
trying to convert this approach to C#.
– hakan
Feb 21 '17 at 11:53
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0.1 float is greater than 0.1 double. I expected it to be false [duplicate]
...
I'd say the answer depends on the rounding mode when converting the double to float. float has 24 binary bits of precision, and double has 53. In binary, 0.1 is:
0.1₁₀ = 0.0001100110011001100110011001100110011001100110011…₂
^ ^ ^ ^
...
How to find the duration of difference between two dates in java?
...
Alternatively long diffInSeconds = TimeUnit.SECONDS.convert(duration,TimeUnit.MILLSECONDS);
– gerardw
Jul 3 '14 at 16:50
3
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How to change letter spacing in a Textview?
.... I get an error like this: "1.2dp" in attribute "letterSpacing" cannot be converted to float."
– dopatraman
Jan 16 '16 at 20:19
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