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#pragma once
#include <cstdint>
#include <stdexcept>
#include <tuple>
#include <type_traits>
namespace crow
{
namespace black_magic
{
struct OutOfRange
{
OutOfRange(unsigned pos, unsigned length) {}
};
constexpr unsigned requires_in_range( unsigned i, unsigned len )
{
return i >= len ? throw OutOfRange(i, len) : i;
}
class const_str
{
const char * const begin_;
unsigned size_;
public:
template< unsigned N >
constexpr const_str( const char(&arr)[N] ) : begin_(arr), size_(N - 1) {
static_assert( N >= 1, "not a string literal");
}
constexpr char operator[]( unsigned i ) const {
return requires_in_range(i, size_), begin_[i];
}
constexpr operator const char *() const {
return begin_;
}
constexpr const char* begin() const { return begin_; }
constexpr const char* end() const { return begin_ + size_; }
constexpr unsigned size() const {
return size_;
}
};
constexpr unsigned find_closing_tag(const_str s, unsigned p)
{
return s[p] == '>' ? p : find_closing_tag(s, p+1);
}
constexpr bool is_valid(const_str s, unsigned i = 0, int f = 0)
{
return
i == s.size()
? f == 0 :
f < 0 || f >= 2
? false :
s[i] == '<'
? is_valid(s, i+1, f+1) :
s[i] == '>'
? is_valid(s, i+1, f-1) :
is_valid(s, i+1, f);
}
constexpr bool is_equ_p(const char* a, const char* b, unsigned n)
{
return
*a == 0 && *b == 0 && n == 0
? true :
(*a == 0 || *b == 0)
? false :
n == 0
? true :
*a != *b
? false :
is_equ_p(a+1, b+1, n-1);
}
constexpr bool is_equ_n(const_str a, unsigned ai, const_str b, unsigned bi, unsigned n)
{
return
ai + n > a.size() || bi + n > b.size()
? false :
n == 0
? true :
a[ai] != b[bi]
? false :
is_equ_n(a,ai+1,b,bi+1,n-1);
}
constexpr bool is_int(const_str s, unsigned i)
{
return is_equ_n(s, i, "<int>", 0, 5);
}
constexpr bool is_uint(const_str s, unsigned i)
{
return is_equ_n(s, i, "<uint>", 0, 6);
}
constexpr bool is_float(const_str s, unsigned i)
{
return is_equ_n(s, i, "<float>", 0, 7) ||
is_equ_n(s, i, "<double>", 0, 8);
}
constexpr bool is_str(const_str s, unsigned i)
{
return is_equ_n(s, i, "<str>", 0, 5) ||
is_equ_n(s, i, "<string>", 0, 8);
}
constexpr bool is_path(const_str s, unsigned i)
{
return is_equ_n(s, i, "<path>", 0, 6);
}
constexpr uint64_t get_parameter_tag(const_str s, unsigned p = 0)
{
return
p == s.size()
? 0 :
s[p] == '<' ? (
is_int(s, p)
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 1 :
is_uint(s, p)
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 2 :
is_float(s, p)
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 3 :
is_str(s, p)
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 4 :
is_path(s, p)
? get_parameter_tag(s, find_closing_tag(s, p)) * 6 + 5 :
throw std::runtime_error("invalid parameter type")
) :
get_parameter_tag(s, p+1);
}
template <typename ... T>
struct S
{
template <typename U>
using push = S<U, T...>;
template <typename U>
using push_back = S<T..., U>;
template <template<typename ... Args> class U>
using rebind = U<T...>;
};
template <typename F, typename Set>
struct CallHelper;
template <typename F, typename ...Args>
struct CallHelper<F, S<Args...>>
{
template <typename F1, typename ...Args1, typename =
decltype(std::declval<F1>()(std::declval<Args1>()...))
>
static char __test(int);
template <typename ...>
static int __test(...);
static constexpr bool value = sizeof(__test<F, Args...>(0)) == sizeof(char);
};
template <int N>
struct single_tag_to_type
{
};
template <>
struct single_tag_to_type<1>
{
using type = int64_t;
};
template <>
struct single_tag_to_type<2>
{
using type = uint64_t;
};
template <>
struct single_tag_to_type<3>
{
using type = double;
};
template <>
struct single_tag_to_type<4>
{
using type = std::string;
};
template <>
struct single_tag_to_type<5>
{
using type = std::string;
};
template <uint64_t Tag>
struct arguments
{
using subarguments = typename arguments<Tag/6>::type;
using type =
typename subarguments::template push<typename single_tag_to_type<Tag%6>::type>;
};
template <>
struct arguments<0>
{
using type = S<>;
};
template <typename ... T>
struct last_element_type
{
using type = typename std::tuple_element<sizeof...(T)-1, std::tuple<T...>>::type;
};
template <>
struct last_element_type<>
{
};
// from http://stackoverflow.com/questions/13072359/c11-compile-time-array-with-logarithmic-evaluation-depth
template<class T> using Invoke = typename T::type;
template<unsigned...> struct seq{ using type = seq; };
template<class S1, class S2> struct concat;
template<unsigned... I1, unsigned... I2>
struct concat<seq<I1...>, seq<I2...>>
: seq<I1..., (sizeof...(I1)+I2)...>{};
template<class S1, class S2>
using Concat = Invoke<concat<S1, S2>>;
template<unsigned N> struct gen_seq;
template<unsigned N> using GenSeq = Invoke<gen_seq<N>>;
template<unsigned N>
struct gen_seq : Concat<GenSeq<N/2>, GenSeq<N - N/2>>{};
template<> struct gen_seq<0> : seq<>{};
template<> struct gen_seq<1> : seq<0>{};
template <typename Seq, typename Tuple>
struct pop_back_helper;
template <unsigned ... N, typename Tuple>
struct pop_back_helper<seq<N...>, Tuple>
{
template <template <typename ... Args> class U>
using rebind = U<typename std::tuple_element<N, Tuple>::type...>;
};
template <typename ... T>
struct pop_back //: public pop_back_helper<typename gen_seq<sizeof...(T)-1>::type, std::tuple<T...>>
{
template <template <typename ... Args> class U>
using rebind = typename pop_back_helper<typename gen_seq<sizeof...(T)-1>::type, std::tuple<T...>>::template rebind<U>;
};
template <>
struct pop_back<>
{
template <template <typename ... Args> class U>
using rebind = U<>;
};
// from http://stackoverflow.com/questions/2118541/check-if-c0x-parameter-pack-contains-a-type
template < typename Tp, typename... List >
struct contains : std::true_type {};
template < typename Tp, typename Head, typename... Rest >
struct contains<Tp, Head, Rest...>
: std::conditional< std::is_same<Tp, Head>::value,
std::true_type,
contains<Tp, Rest...>
>::type {};
template < typename Tp >
struct contains<Tp> : std::false_type {};
template <typename T>
struct empty_context
{
};
} // namespace black_magic
namespace detail
{
template <class T, std::size_t N, class... Args>
struct get_index_of_element_from_tuple_by_type_impl
{
static constexpr auto value = N;
};
template <class T, std::size_t N, class... Args>
struct get_index_of_element_from_tuple_by_type_impl<T, N, T, Args...>
{
static constexpr auto value = N;
};
template <class T, std::size_t N, class U, class... Args>
struct get_index_of_element_from_tuple_by_type_impl<T, N, U, Args...>
{
static constexpr auto value = get_index_of_element_from_tuple_by_type_impl<T, N + 1, Args...>::value;
};
} // namespace detail
namespace utility
{
template <class T, class... Args>
T get_element_by_type(std::tuple<Args...>& t)
{
return std::get<detail::get_index_of_element_from_tuple_by_type_impl<T, 0, Args...>::value>(t);
}
template <class T, class... Args>
T* get_element_by_type_ptr(std::tuple<Args...>& t)
{
return &std::get<detail::get_index_of_element_from_tuple_by_type_impl<T, 0, Args...>::value>(t);
}
} // namespace utility
}
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