Remove custom standard lib
Why?? cause it was russian roulette with pointer access stuff etc
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127
include/pd/core/u128.hpp
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127
include/pd/core/u128.hpp
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#pragma once
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#include <pd/core/common.hpp>
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namespace PD {
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/**
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* 128 Bit support for all platforms probably
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* only used for flag checks in Keyboard/Mouse Input driver
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*/
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class u128 {
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public:
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u64 pLow = 0;
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u64 pHigh = 0;
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constexpr u128() : pLow(0), pHigh(0) {}
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constexpr u128(u64 l, u64 h = 0) : pLow(l), pHigh(h) {}
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/**
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* Best way so far to create flags that go over 63
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* like `1 << 65` is just `u128::Flag(65)`
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*/
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constexpr static u128 Flag(u32 i) {
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if (i < 64) {
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return u128(1ULL << i, 0);
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} else if (i < 128) {
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return u128(0, 1ULL << (i - 64));
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}
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return u128();
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}
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constexpr u128 operator+(const u128& v) const {
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u128 ret;
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ret.pLow = pLow + v.pLow;
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ret.pHigh = pHigh + v.pHigh + (ret.pLow < pLow);
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return ret;
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}
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constexpr u128 operator&(const u128& v) const {
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return u128(pLow & v.pLow, pHigh & v.pHigh);
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}
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constexpr u128 operator<<(u32 s) const {
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if (s == 0) {
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return *this;
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}
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if (s >= 128) {
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return u128();
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}
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if (s >= 64) {
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return u128(0, pLow << (s - 64));
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}
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return u128(pLow << s, (pHigh << s) | (pLow >> (64 - s)));
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}
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constexpr u128 operator>>(u32 s) const {
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if (s == 0) {
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return *this;
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}
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if (s >= 128) {
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return u128();
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}
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if (s >= 64) {
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return u128(pHigh >> (s - 64), 0);
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}
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return u128((pLow >> s) | (pHigh << (64 - s)), pHigh >> s);
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}
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constexpr u128& operator|=(const u128& v) {
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pLow |= v.pLow;
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pHigh |= v.pHigh;
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return *this;
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}
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constexpr u128 operator|(const u128& v) const {
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return u128(pLow | v.pLow, pHigh | v.pHigh);
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}
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constexpr u128& operator&=(const u128& v) {
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pLow &= v.pLow;
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pHigh &= v.pHigh;
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return *this;
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}
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constexpr u128 operator~() const { return u128(~pLow, ~pHigh); }
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/**
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* Old why to make if checks possible
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* Problem was that a operator& is required
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* with u128 as result
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*/
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// bool operator&(const u128& v) const {
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// return pLow & v.pLow || pHigh & v.pHigh;
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// }
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constexpr bool operator==(const u128& v) const {
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return pLow == v.pLow && pHigh == v.pHigh;
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}
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/**
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* Use explicit here to make sure it is only for checking and not for
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* some error leading implicit bool assignments...
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*/
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constexpr explicit operator bool() const { return pLow != 0 || pHigh != 0; }
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/** Deprecated way to handle `flag & SomeFlag` */
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constexpr bool Has(const u128& v) const {
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return pLow & v.pLow || pHigh & v.pHigh;
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}
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constexpr bool operator!=(const u128& v) const { return !(*this == v); }
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};
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} // namespace PD
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namespace std {
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/**
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* Provide c++ STL support for unordered map to u128
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*/
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template <>
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struct hash<PD::u128> {
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size_t operator()(const PD::u128& k) const {
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// just combine hashes of the parts usign simple xor op
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size_t h0 = std::hash<PD::u64>{}(k.pLow);
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size_t h1 = std::hash<PD::u64>{}(k.pHigh);
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return h0 ^ (h1 << 1);
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}
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};
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} // namespace std
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