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#ifndef FWDLIB_HPP
#define FWDLIB_HPP
#include <string>
#include <optional>
#include <iostream>
#include <functional>
#include <unordered_map>
#include <unordered_set>
using namespace std;
typedef const char *fwd_err_t;
static fwd_err_t fwd_getline(auto next)
{
if (cin.eof())
return next(optional<string>{});
if (string line; getline(cin, line))
return next(optional<string>{line});
else
return next(optional<string>{});
}
static fwd_err_t fwd_foreach(auto container, auto next)
{
for (auto &n : container)
if (auto e = next(n))
return e;
return nullptr;
}
static fwd_err_t fwd_some(auto option, auto ok, auto fail)
{
if (option)
return ok(std::move(option.value()));
else
return fail();
}
static fwd_err_t fwd_copy(auto n, auto next)
{
return next(n, n);
}
static fwd_err_t fwd_null(auto *x, auto fail, auto ok)
{
if (x)
return ok(*x);
else
return fail();
}
static fwd_err_t fwd_insert(auto container, auto elem, auto next)
{
container.insert(std::move(elem));
return next(std::move(container));
}
static fwd_err_t fwd_println(auto elem)
{
cout << elem << endl;
return nullptr;
}
static fwd_err_t fwd_intalloc(auto ok)
{
int *p = new int{20};
return ok(p);
}
static fwd_err_t fwd_destroy(auto /* a */)
{
/* RAII destroys a */
return nullptr;
}
#endif /* FWDLIB_HPP */
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