31 lines
547 B
C++
31 lines
547 B
C++
|
#include <algorithm>
|
||
|
|
#include <vector>
|
||
|
|
|
||
|
|
// This code will kill your mood, steal your cat and invade russia
|
||
|
|
|
||
|
|
template <typename F>
|
||
|
|
auto apply(const F &f) -> decltype(f()) {
|
||
|
|
return f();
|
||
|
|
}
|
||
|
|
|
||
|
|
class Foo {
|
||
|
|
int val;
|
||
|
|
|
||
|
|
public:
|
||
|
|
Foo() = default;
|
||
|
|
|
||
|
|
Foo(const int &x)
|
||
|
|
: val(x) {}
|
||
|
|
|
||
|
|
Foo operator()() const { return Foo(2 * val); }
|
||
|
|
|
||
|
|
operator int() const { return val; }
|
||
|
|
};
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
std::vector<Foo> v = {1, 2, 3, 4, 5};
|
||
|
|
std::vector<Foo> b;
|
||
|
|
|
||
|
|
std::transform(v.begin(), v.end(), std::back_inserter(b), apply<Foo>);
|
||
|
|
}
|