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-rw-r--r--src/openvic-simulation/utility/Utility.hpp62
1 files changed, 51 insertions, 11 deletions
diff --git a/src/openvic-simulation/utility/Utility.hpp b/src/openvic-simulation/utility/Utility.hpp
index 0387e7f..dbbcf8f 100644
--- a/src/openvic-simulation/utility/Utility.hpp
+++ b/src/openvic-simulation/utility/Utility.hpp
@@ -4,6 +4,21 @@
#include <functional>
#include <type_traits>
+#if defined(__GNUC__)
+#define OV_likely(x) __builtin_expect(!!(x), 1)
+#define OV_unlikely(x) __builtin_expect(!!(x), 0)
+#else
+#define OV_likely(x) x
+#define OV_unlikely(x) x
+#endif
+
+// Turn argument to string constant:
+// https://gcc.gnu.org/onlinedocs/cpp/Stringizing.html#Stringizing
+#ifndef _OV_STR
+#define _OV_STR(m_x) #m_x
+#define _OV_MKSTR(m_x) _OV_STR(m_x)
+#endif
+
namespace OpenVic::utility {
[[noreturn]] inline void unreachable() {
// Uses compiler specific extensions if possible.
@@ -25,29 +40,35 @@ namespace OpenVic::utility {
template<size_t Shift, class T>
constexpr inline void hash_combine_index(std::size_t& s, const T& v) {
std::hash<T> h;
- if constexpr(Shift == 0) {
+ if constexpr (Shift == 0) {
s = h(v);
} else {
s ^= h(v) << Shift;
}
}
- template<class T, typename ...Args>
+ template<class T, typename... Args>
constexpr void perfect_hash(std::size_t& s, T&& v, Args&&... args) {
- static_assert(sizeof(T) + (sizeof(Args) + ...) <= sizeof(std::size_t), "Perfect hashes must be able to fit into size_t");
+ static_assert(
+ sizeof(T) + (sizeof(Args) + ...) <= sizeof(std::size_t), "Perfect hashes must be able to fit into size_t"
+ );
std::hash<T> h;
- if constexpr(sizeof...(args) == 0) {
+ if constexpr (sizeof...(args) == 0) {
s = h(v);
} else {
const std::tuple arg_tuple { args... };
s = h(v) << (sizeof(T) * CHAR_BIT);
- ([&]{
- // If args is not last pointer of args
- if (static_cast<const void*>(&(std::get<sizeof...(args) - 1>(arg_tuple))) != static_cast<const void*>(&args)) {
- s <<= sizeof(Args) * CHAR_BIT;
- }
- s |= std::hash<Args>{}(args);
- }(), ...);
+ (
+ [&] {
+ // If args is not last pointer of args
+ if (static_cast<const void*>(&(std::get<sizeof...(args) - 1>(arg_tuple))) !=
+ static_cast<const void*>(&args)) {
+ s <<= sizeof(Args) * CHAR_BIT;
+ }
+ s |= std::hash<Args> {}(args);
+ }(),
+ ...
+ );
}
}
@@ -59,4 +80,23 @@ namespace OpenVic::utility {
template<typename T, template<typename...> class Z>
inline constexpr bool is_specialization_of_v = is_specialization_of<T, Z>::value;
+
+ inline constexpr auto three_way(auto&& left, auto&& right) {
+ // This is Apple's fault again
+ #if __cpp_lib_three_way_comparison >= 201907L
+ if constexpr (std::three_way_comparable_with<std::decay_t<decltype(left)>, std::decay_t<decltype(right)>>) {
+ return left <=> right;
+ } else
+ #endif
+ {
+ if (left < right) {
+ return std::weak_ordering::less;
+ } else if (left > right) {
+ return std::weak_ordering::greater;
+ } else {
+ return std::weak_ordering::equivalent;
+ }
+ }
+ };
+
}