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When should I use C++14 automatic return type deduction?
...n though there is a proposal to change this behaviour). Take for example a foobar function that will call a type's foo member function if it exists or call the type's bar member function if it exists, and assume that a class always has exacty foo or bar but neither both at once:
struct X
{
void...
What is the difference between const int*, const int * const, and int const *?
...are clear on the meaning of const:
int a = 5, b = 10, c = 15;
const int* foo; // pointer to constant int.
foo = &a; // assignment to where foo points to.
/* dummy statement*/
*foo = 6; // the value of a can´t get changed through the pointer.
foo = &b; /...
How to implement static class member functions in *.cpp file?
...
Try this:
header.hxx:
class CFoo
{
public:
static bool IsThisThingOn();
};
class.cxx:
#include "header.hxx"
bool CFoo::IsThisThingOn() // note: no static keyword here
{
return true;
}
...
How much is too much with C++11 auto keyword?
...us to the reader what type auto represents.
Here are some examples:
auto foo = std::make_shared<Foo>(); // obvious
auto foo = bla(); // unclear. don't know which type `foo` has
const size_t max_size = 100;
for ( auto x = max_size; x > 0; --x ) // unclear. could lead...
Overloaded method selection based on the parameter's real type
...s used to determine the signature of the method to be called, in this case foo(Object). At runtime, the class of the object the method is called on determines which implementation of that method is called, taking into account that it may be an instance of a subclass of the declared type that overrid...
Static function variables in Swift
... class/struct. Try declaring a private struct with static variable.
func foo() -> Int {
struct Holder {
static var timesCalled = 0
}
Holder.timesCalled += 1
return Holder.timesCalled
}
7> foo()
$R0: Int = 1
8> foo()
$R1: Int = 2
9> foo()
$R2: Int = 3
...
Convert timestamp to date in MySQL query
...n MYSQL
Make the table with an integer timestamp:
mysql> create table foo(id INT, mytimestamp INT(11));
Query OK, 0 rows affected (0.02 sec)
Insert some values
mysql> insert into foo values(1, 1381262848);
Query OK, 1 row affected (0.01 sec)
Take a look
mysql> select * from foo;
+--...
Merge git repo into branch of another repo
Given repo Foo and repo Bar. I want to merge Bar with Foo, but only into a separate branch, called baz .
3 Answers
...
Aren't Python strings immutable? Then why does a + “ ” + b work?
...
The variable, a, which points to the string, is mutable.
Consider:
a = "Foo"
# a now points to "Foo"
b = a
# b points to the same "Foo" that a points to
a = a + a
# a points to the new string "FooFoo", but b still points to the old "Foo"
print a
print b
# Outputs:
# FooFoo
# Foo
# Observe that...
Effects of the extern keyword on C functions
...
We have two files, foo.c and bar.c.
Here is foo.c
#include <stdio.h>
volatile unsigned int stop_now = 0;
extern void bar_function(void);
int main(void)
{
while (1) {
bar_function();
stop_now = 1;
}
return 0;
}
Now, h...