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Exposing limb type choice by introducing _ZL and _ZLL #48

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Exposing limb type choice by introducing _ZL and _ZLL #48

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28 changes: 27 additions & 1 deletion include/ctbignum/decimal_literals.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,10 +51,12 @@ constexpr auto chars_to_integer_seq(std::integer_sequence<char, Chars...>,
} //end of detail namespace

namespace literals {
template <char... Chars> constexpr auto operator"" _Z() {
template <char... Chars> [[deprecated("Consider using _ZL or _ZLL which explicitly specifies limb size as uint32_t or uint64_t")]] constexpr auto operator"" _Z() {

using T = uint64_t; // Question: How to elegantly expose the choice of this
// type to the user?
// Answer: Check below, inspired from `The type of the literal`
// table at https://en.cppreference.com/w/cpp/language/integer_literal

constexpr size_t len = sizeof...(Chars);
constexpr size_t N = 1 + (10 * len) / (3 * std::numeric_limits<T>::digits);
Expand All @@ -63,6 +65,30 @@ template <char... Chars> constexpr auto operator"" _Z() {
constexpr auto L = detail::tight_length(num) + (to_big_int(num) == big_int<1, T>{});
return detail::take_first(num, std::make_index_sequence<L>{});
}

template <char... Chars> constexpr auto operator"" _ZL() {

using T = uint32_t;

constexpr size_t len = sizeof...(Chars);
constexpr size_t N = 1 + (10 * len) / (3 * std::numeric_limits<T>::digits);

auto num = detail::chars_to_integer_seq<T>(std::integer_sequence<char, Chars...>{}, std::make_index_sequence<N>{});
constexpr auto L = detail::tight_length(num) + (to_big_int(num) == big_int<1, T>{});
return detail::take_first<T>(num, std::make_index_sequence<L>{});
}

template <char... Chars> constexpr auto operator"" _ZLL() {

using T = uint64_t;

constexpr size_t len = sizeof...(Chars);
constexpr size_t N = 1 + (10 * len) / (3 * std::numeric_limits<T>::digits);

auto num = detail::chars_to_integer_seq<T>(std::integer_sequence<char, Chars...>{}, std::make_index_sequence<N>{});
constexpr auto L = detail::tight_length(num) + (to_big_int(num) == big_int<1, T>{});
return detail::take_first<T>(num, std::make_index_sequence<L>{});
}
}

} // end of cbn namespace
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