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What does void* mean and how to use it?
.... A void * can be converted to any other pointer type without an explicit cast. You cannot dereference a void * or do pointer arithmetic with it; you must convert it to a pointer to a complete data type first.
void * is often used in places where you need to be able to work with different pointer...
postgresql - sql - count of `true` values
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@EoghanM, see shorter answer involving cast.
– Dwayne Towell
Jan 3 '14 at 18:10
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Python 2.7 getting user input and manipulating as string without quotations
... function takes an input in string format. For other data type you have to cast the user input.
In Python 2 we use the raw_input() function. It waits for the user to type some input and press return and we need to store the value in a variable by casting as our desire data type. Be careful when usi...
How do you specify a byte literal in Java?
...ered an integer (or long if followed by a "L"), so you must explicitly downcast it to a byte to pass it as a parameter. As far as I know there is no shortcut.
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Lambda capture as const reference?
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In c++14 using static_cast / const_cast:
[&best_string = static_cast<const std::string&>(best_string)](const string& s)
{
best_string = s; // fails
};
DEMO
In c++17 using std::as_const:
[&best_string = std::as_cons...
Converting an integer to a string in PHP
...ove have the same end value...
// ... And so do the two below
// Explicit cast
$items = (string)$var; // $items === "5";
// Function call
$items = strval($var); // $items === "5";
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How do you append an int to a string in C++? [duplicate]
...;
text += oss.str();
Finally, the Boost libraries provide boost::lexical_cast, which wraps around the stringstream conversion with a syntax like the built-in type casts.
#include <boost/lexical_cast.hpp>
text += boost::lexical_cast<std::string>(i);
This also works the other way aro...
Rename a file in C#
...ode-time convenience... What kind of network? Windows shared folder (smb), ftp , ssh or whatever all have commands/primitives for file moving/renaming unless not permitted (e.g. read-only).
– Meow Cat 2012
Aug 27 '19 at 3:18
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./configure : /bin/sh^M : bad interpreter [duplicate]
... instead of simple LF line endings (unix style). Did you transfer it using FTP mode ASCII from Windows?
You can use
dos2unix configure
to fix this, or open it in vi and use :%s/^M//g; to substitute them all (use CTRL+V, CTRL+M to get the ^M)
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What is the difference between precision and scale?
...: Precision 4, scale 2 - will fail any number > 99.9999..; try: select cast (99.99999 as NUMBER(4,2)) from dual; //OK; select cast (100.9 as NUMBER(4,2)) from dual; //FAIL;
– Jama Djafarov
Mar 6 '15 at 17:47
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