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author George L. Albany <Megacake1234@gmail.com>2023-10-12 16:21:38 +0200
committer GitHub <noreply@github.com>2023-10-12 16:21:38 +0200
commitbb22324da1225a0ac458c1d69893bb3bd28bd6b7 (patch)
treeefeebd80a707a07eda296883772140e9ce32a9ee /src/openvic-simulation/utility
parent1d113b46161f27551bc3a6a857b8727cfb657b81 (diff)
parent5c7af98e3a8a3e7f1462e389c273566d7cdaa5d4 (diff)
Merge pull request #43 from OpenVicProject/add/vdf-search
Diffstat (limited to 'src/openvic-simulation/utility')
-rw-r--r--src/openvic-simulation/utility/ConstexprIntToStr.hpp56
1 files changed, 56 insertions, 0 deletions
diff --git a/src/openvic-simulation/utility/ConstexprIntToStr.hpp b/src/openvic-simulation/utility/ConstexprIntToStr.hpp
new file mode 100644
index 0000000..e383365
--- /dev/null
+++ b/src/openvic-simulation/utility/ConstexprIntToStr.hpp
@@ -0,0 +1,56 @@
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <string_view>
+#include <utility>
+
+namespace OpenVic::ConstexprIntToStr {
+ template<class T, T... values1, T... values2>
+ constexpr decltype(auto) append_sequence(std::integer_sequence<T, values1...>, std::integer_sequence<T, values2...>) {
+ return std::integer_sequence<T, values1..., values2...> {};
+ }
+
+ template<class sequence_t>
+ struct string_sequence_to_view;
+
+ template<char... chars>
+ struct string_sequence_to_view<std::integer_sequence<char, chars...>> {
+ static constexpr decltype(auto) get() {
+ return std::string_view { c_str };
+ }
+
+ static constexpr const char c_str[] { chars..., char {} };
+ };
+
+ template<std::size_t value>
+ constexpr decltype(auto) integer_to_string_sequence() {
+ constexpr auto digits = []() {
+ return "0123456789abcdefghijklmnopqrstuvwxyz";
+ };
+
+ constexpr std::size_t remainder = value % 10;
+ constexpr std::size_t next_value = value / 10;
+
+ if constexpr (next_value != 0) {
+ return append_sequence(integer_to_string_sequence<next_value>(), std::integer_sequence<char, digits()[remainder]> {});
+ } else {
+ return std::integer_sequence<char, digits()[remainder]> {};
+ }
+ }
+ template<std::size_t i>
+ constexpr std::string_view make_string() {
+ return string_sequence_to_view<decltype(integer_to_string_sequence<i>())> {}.c_str;
+ }
+
+ template<std::size_t... ManyIntegers>
+ constexpr auto generate_itosv_array(std::integer_sequence<std::size_t, ManyIntegers...>) {
+ return std::array<std::string_view, sizeof...(ManyIntegers)> { make_string<ManyIntegers>()... };
+ }
+
+ // Make array of N string views, countings up from 0 to N - 1
+ template<std::size_t N>
+ constexpr auto make_itosv_array() {
+ return generate_itosv_array(std::make_integer_sequence<std::size_t, N>());
+ }
+} \ No newline at end of file