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Why can a function modify some arguments as perceived by the caller, but not others?
...s make sense if you want to provide optional output destination as in: def foo(x, l=None): l=l or []; l.append(x**2); return l[-1].
– Janusz Lenar
Aug 31 '12 at 13:03
...
Are the days of passing const std::string & as a parameter over?
...r, it also depends on what you use.
Lets consider next functions :
bool foo1( const std::string v )
{
return v.empty();
}
bool foo2( const std::string & v )
{
return v.empty();
}
These functions are implemented in a separate compilation unit in order to avoid inlining. Then :
1. If you ...
What is the Scala identifier “implicitly”?
... a type parameter A that requires an implicit parameter of type M[A]:
def foo[A](implicit ma: M[A])
can be rewritten as:
def foo[A: M]
But what's the point of passing the implicit parameter but not naming it? How can this be useful when implementing the method foo?
Often, the implicit paramet...
Why do this() and super() have to be the first statement in a constructor?
...ic methods. What I wanted to do looked something like this:
public class Foo extends Baz {
private final Bar myBar;
public Foo(String arg1, String arg2) {
// ...
// ... Some other stuff needed to construct a 'Bar'...
// ...
final Bar b = new Bar(arg1, arg2);
super(b.baz())...
Pass a local file in to URL in Java
...and then lists the host (generally omitted), followed by "/" and the path "foo/bar" (generally meant to be read as an absolute path). Thus "file:///foo/var". An URI that looks like "file:/foo/bar" is incorrect. See also: file URI scheme
– David Tonhofer
Sep 2 '...
How do you print in a Go test using the “testing” package?
... issue 24929
Consider the following (silly) automated tests:
func TestFoo(t *testing.T) {
t.Parallel()
for i := 0; i < 15; i++ {
t.Logf("%d", i)
time.Sleep(3 * time.Second)
}
}
func TestBar(t *testing.T) {
t.Parallel()
for i := 0; i < 15; i++ {
t...
What is the logic behind the “using” keyword in C++?
...n-deducible context. That is, it will not be possible to
call the function foo below without explicitly specifying template
arguments.
template <typename T> void foo (Vec<T>::type&);
So, the syntax is somewhat ugly. We would rather avoid the nested ::type
We’d prefer something lik...
Set value of textarea in jQuery
...
val(foo) works for me (jQuery 1.9.1). Using text(foo) loses to update textarea content loses the linebreaks on IE, using val(foo) preserves them.
– Tim
Sep 11 '13 at 9:21
...
Qt: *.pro vs *.pri
...l .pro files as the need arises. This is how you would use it in practice:
foo.pri
FOO = BAR
hello.pro
...
include($$PWD/foo.pri)
...
world.pro
...
include($$PWD/foo.pri)
...
This way, the commonality would be available both in hello.pro as well as world.pro. It does not make much of difference i...
How to show changed file name only with git log? [duplicate]
...puts a list of files only and their state (added, modified, deleted):
A foo/bar/xyz/foo.txt
M foo/bor/bar.txt
...
The -k2,2 option for sort, makes it sort by file path instead of the type of change (A, M, D,).
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