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What is the meaning of “… …” token? i.e. double ellipsis operator on parameter pack
...ame T >
T const &printf_helper( T const &x )
{ return x; }
char const *printf_helper( std::string const &x )
{ return x.c_str(); }
template< typename ... Req, typename ... Given >
int wrap_printf( int (*fn)( Req... ... ), Given ... args ) {
return fn( printf_helper...
How to request Administrator access inside a batch file
...mc
:: v1.4 - 17/05/2016 - Added instructions for arguments with ! char
:: v1.3 - 01/08/2015 - Fixed not returning to original folder after elevation successful
:: v1.2 - 30/07/2015 - Added error message when running from mapped drive
:: v1.1 - 01/06/2015
::
:: Fu...
What is the difference between String and string in C#?
...nt64
float: System.Single
double: System.Double
decimal: System.Decimal
char: System.Char
Apart from string and object, the aliases are all to value types. decimal is a value type, but not a primitive type in the CLR. The only primitive type which doesn't have an alias is System.IntPtr.
In ...
How can I convert a hex string to a byte array? [duplicate]
...sed with LINQ's elegance and versatility
– Michael Richardson
Apr 10 '15 at 13:35
6
Came up with ...
Printing the correct number of decimal points with cout
...d/
#include <iostream>
#include <iomanip>
int main(int argc, char** argv)
{
float testme[] = { 0.12345, 1.2345, 12.345, 123.45, 1234.5, 12345 };
std::cout << std::setprecision(2) << std::fixed;
for(int i = 0; i < 6; ++i)
{
std::cout << tes...
What is the memory consumption of an object in Java?
... storage overhead.
String: a String's memory growth tracks its internal char array's growth. However, the String class adds another 24 bytes of overhead.
For a nonempty String of size 10 characters or less, the added overhead cost relative to useful payload (2 bytes for each char plus 4 byte...
How to convert String to Long in Kotlin?
... Just a heads up, if you're iterating a string of digits, they will be chars and [char].toInt() will give you the ascii representation.
– Peheje
Jul 20 '17 at 17:11
add a ...
Adding new column to existing DataFrame in Python pandas
... @Owlright From the question, it appears that the OP is simply concatenating the dataframes and ignoring the index. If this is the case, the the methods above will work. If one wishes to retain the index, then use something like df_new = pd.concat([df1, df2], axis=1), noting that ignore...
convert a list of objects from one type to another using lambda expression
...
Here's a simple example..
List<char> c = new List<char>() { 'A', 'B', 'C' };
List<string> s = c.Select(x => x.ToString()).ToList();
share
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How to define a preprocessor symbol in Xcode
...
For Xcode 9.4.1 and C++ project. Adding const char* Preprocessor Macros to both Debug and Release builds.
Select your project
Select Build Settings
Search "Preprocessor Macros"
Open interactive list
Add your macros and don't forget to escape quotation
Use in...