Created
September 27, 2013 17:51
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Extends the number of arguments, can be regarded as an inverse transformation of currying
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| #include <iostream> | |
| #include <functional> | |
| using namespace std; | |
| template <typename ... _> struct extend; | |
| template <typename t_ret, typename ... t_args, typename ... t_arge> | |
| struct extend <t_ret(t_args ...) , t_arge ...> { | |
| static std::function<t_ret(t_args ..., t_arge ...)> impl (std::function<t_ret(t_args ...)> f) { | |
| return [=] (t_args ... args, t_arge ... arge) { | |
| return f(args ...); | |
| }; | |
| } | |
| }; | |
| int main(int argc, char *argv[]) | |
| { | |
| std::function<void(float, int, double)> f; | |
| int z; | |
| auto a = [&](float x, int, double){z = x; cout << z;}; | |
| auto b = [&](float x, int){z = x; cout << z;}; | |
| auto c = [&](double x){z = x; cout << z;}; | |
| f = a; | |
| f(1, 2, 3); | |
| //f = b; //?!?! | |
| f = extend<void(float, int), double>::impl(b); | |
| f(4, 5, 6); | |
| //f = c; //?!?! | |
| f = extend<void(float), int, double>::impl(c); | |
| f(7, 8, 9); | |
| return 0; | |
| } |
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