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How is null + true a string?
...t's walk through this in turn.
X is the null type here - or not a type at all, if you want to think of it that way. It's not providing any candidates. Y is bool, which doesn't provide any user-defined + operators. So the first step finds no user-defined operators.
The compiler then moves on to the...
CMake link to external library
...uilds), don't do this.
This is a CMake bug, see http://cmake.org/Bug/view.php?id=14185 and http://gitlab.kitware.com/cmake/cmake/issues/14185
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Input from the keyboard in command line application
...ect way to do this is to use readLine, from the Swift Standard Library.
Example:
let response = readLine()
Will give you an Optional value containing the entered text.
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How do I select a merge strategy for a git rebase?
...rbose=0
backup=1
inplace=0
ext=".bak"
message() { printf "%s\n" "$1" >&2 ; }
skip() { message "skipping ${2:-$file}${1:+: $1}"; continue ; }
argerr() { printf "%s: %s\n" "$myname" "${1:-error}" >&2 ; usage 1 ; }
invalid() { argerr "invalid option: $1" ; }
missing() { argerr "missi...
Fastest way to list all primes below N
...3) ::2*k]=[False]*((n/6-(k*k)/6-1)/k+1)
sieve[(k*k+4*k-2*k*(i&1))/3::2*k]=[False]*((n/6-(k*k+4*k-2*k*(i&1))/6-1)/k+1)
return [2,3] + [3*i+1|1 for i in xrange(1,n/3-correction) if sieve[i]]
def sieve_wheel_30(N):
# http://zerovolt.com/?p=88
''' Returns a list of prim...
Command line to remove an environment variable from the OS level configuration
...ext cmd shell) and then remove it from the registry, e.g.: SETX FOOBAR "" & REG delete HKCU\Environment /F /V FOOBAR
– Luke
Aug 4 '17 at 17:02
1
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Converting Mercurial folder to a Git repository
...ocal repository or a remote repository accessed via SSH, HTTP or HTTPS.
Example of local repositories conversion.
Install Hg-Git.
On Windows, TortoiseHg comes with Hg-Git, though you need to enable it via the setting tool (in extensions section)
or manually in ~/mercurial.ini
[extensions]
h...
Difference in make_shared and normal shared_ptr in C++
... exception-safety side of things, I've updated my answer.
Consider this example,
void F(const std::shared_ptr<Lhs> &lhs, const std::shared_ptr<Rhs> &rhs) { /* ... */ }
F(std::shared_ptr<Lhs>(new Lhs("foo")),
std::shared_ptr<Rhs>(new Rhs("bar")));
Because C++ al...
How can I create directory tree in C++/Linux?
... Stat st;
int status = 0;
if (stat(path, &st) != 0)
{
/* Directory does not exist. EEXIST for race condition */
if (mkdir(path, mode) != 0 && errno != EEXIST)
status = -1;
}
else if (!S_ISDIR(st.st_mode))
{
...
Python - When to use file vs open
What's the difference between file and open in Python? When should I use which one? (Say I'm in 2.5)
6 Answers
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