On 11/09/2012 10:30 AM, Manfred Nowak wrote:
> Jack Applegame wrote:
>
>> Ok. Then how to implement in D this С++ std::function feature?
>>
>> http://liveworkspace.org/code/01aa058901529f65cb9a3cc4ba605248
>
> That feature is among others defined here:
> http://en.cppreference.com/w/cpp/utility/functional/function
The following D program produces the same output as the C++ example there:
import std.stdio : writeln;
import std.functional : curry;
struct Foo
{
int num;
void print_add(int i)
{
writeln(num + i);
}
}
void print_num(int i)
{
writeln(i);
}
void main()
{
// store a free function
auto f_display = &print_num;
f_display(-9);
// store a lambda
auto f_display_42 = { print_num(42); };
f_display_42();
// store a curried call
alias curry!(print_num, 31337) f_display_31337;
f_display_31337();
// store a call to a member function
auto f_add_display = (Foo foo, int i) { return foo.print_add(i); };
auto foo = Foo(314159);
f_add_display(foo, 1);
}
D has more features:
// store a call to a member function on a particular object
auto f_print_add_on_object = &foo.print_add;
f_print_add_on_object(2);
There is also std.functional.toDelegate:
http://dlang.org/phobos/std_functional.html#toDelegate
Ali
