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File indexing completed on 2023-03-17 10:50:29

 #ifndef DataFormats_L1TrackTrigger_TTBV_h
 #define DataFormats_L1TrackTrigger_TTBV_h
 
 #include <bitset>
 #include <array>
 #include <string>
 #include <algorithm>
 #include <cmath>
 #include <utility>
 #include <vector>
 #include <iostream>
 
 /*! 
  * \class  TTBV
  * \brief  Bit vector used by Track Trigger emulators. Mainly used to convert
  *         integers into arbitrary (within margin) sized two's complement strings.
  * \author Thomas Schuh
  * \date   2020, Jan
  */
 class TTBV {
 public:
   static constexpr int S_ = 64;  // Frame width of emp infrastructure f/w, max number of bits a TTBV can handle
 
 private:
   bool twos_;           // Two's complement (true) or binary (false)
   int size_;            // number or bits
   std::bitset<S_> bs_;  // underlying storage
 
 public:
   // constructor: default
   TTBV() : twos_(false), size_(0), bs_() {}
 
   // constructor: double precision (IEEE 754); from most to least significant bit: 1 bit sign + 11 bit binary exponent + 52 bit binary mantisse
   TTBV(const double d) : twos_(false), size_(S_) {
     int index(0);
     const char* c = reinterpret_cast<const char*>(&d);
     for (int iByte = 0; iByte < (int)sizeof(d); iByte++) {
       const std::bitset<std::numeric_limits<unsigned char>::digits> byte(*(c + iByte));
       for (int bit = 0; bit < std::numeric_limits<unsigned char>::digits; bit++)
         bs_[index++] = byte[bit];
     }
   }
 
   // constructor: unsigned int value
   TTBV(unsigned long long int value, int size) : twos_(false), size_(size), bs_(value) {}
 
   // constructor: int value
   TTBV(int value, int size, bool twos = false)
       : twos_(twos), size_(size), bs_((!twos || value >= 0) ? value : value + iMax()) {}
 
   // constructor: double value + precision, biased (floor) representation
   TTBV(double value, double base, int size, bool twos = false) : TTBV((int)std::floor(value / base), size, twos) {}
 
   // constructor: string
   TTBV(const std::string& str, bool twos = false) : twos_(twos), size_(str.size()), bs_(str) {}
 
   // constructor: bitset
   TTBV(const std::bitset<S_>& bs, bool twos = false) : twos_(twos), size_(S_), bs_(bs) {}
 
   // constructor: slice reinterpret sign
   TTBV(const TTBV& ttBV, int begin, int end = 0, bool twos = false) : twos_(twos), size_(begin - end), bs_(ttBV.bs_) {
     bs_ <<= S_ - begin;
     bs_ >>= S_ - begin + end;
   }
 
   // Two's complement (true) or binary (false)
   bool twos() const { return twos_; }
   // number or bits
   int size() const { return size_; }
   // underlying storage
   const std::bitset<S_>& bs() const { return bs_; }
 
   // access: single bit
   bool operator[](int pos) const { return bs_[pos]; }
   std::bitset<S_>::reference operator[](int pos) { return bs_[pos]; }
 
   // access: most significant bit copy
   bool msb() const { return bs_[size_ - 1]; }
 
   // access: most significant bit reference
   std::bitset<S_>::reference msb() { return bs_[size_ - 1]; }
 
   // access: members of underlying bitset
 
   bool all() const { return bs_.all(); }
   bool any() const { return bs_.any(); }
   bool none() const { return bs_.none(); }
   int count() const { return bs_.count(); }
 
   // operator: comparisons equal
   bool operator==(const TTBV& rhs) const { return bs_ == rhs.bs_; }
 
   // operator: comparisons not equal
   bool operator!=(const TTBV& rhs) const { return bs_ != rhs.bs_; }
 
   // operator: boolean and
   TTBV& operator&=(const TTBV& rhs) {
     const int m(std::max(size_, rhs.size()));
     this->resize(m);
     TTBV bv(rhs);
     bv.resize(m);
     bs_ &= bv.bs_;
     return *this;
   }
 
   // operator: boolean or
   TTBV& operator|=(const TTBV& rhs) {
     const int m(std::max(size_, rhs.size()));
     this->resize(m);
     TTBV bv(rhs);
     bv.resize(m);
     bs_ |= bv.bs_;
     return *this;
   }
 
   // operator: boolean xor
   TTBV& operator^=(const TTBV& rhs) {
     const int m(std::max(size_, rhs.size()));
     this->resize(m);
     TTBV bv(rhs);
     bv.resize(m);
     bs_ ^= bv.bs_;
     return *this;
   }
 
   // operator: not
   TTBV operator~() const {
     TTBV bv(*this);
     return bv.flip();
   }
 
   // reference operator: bit remove right
   TTBV& operator>>=(int pos) {
     bs_ >>= pos;
     size_ -= pos;
     return *this;
   }
 
   // reference operator: bit remove left
   TTBV& operator<<=(int pos) {
     bs_ <<= S_ - size_ + pos;
     bs_ >>= S_ - size_ + pos;
     size_ -= pos;
     return *this;
   }
 
   // operator: bit remove left copy
   TTBV operator<<(int pos) const {
     TTBV bv(*this);
     return bv <<= pos;
   }
 
   // operator: bit remove right copy
   TTBV operator>>(int pos) const {
     TTBV bv(*this);
     return bv >>= pos;
   }
 
   // reference operator: concatenation
   TTBV& operator+=(const TTBV& rhs) {
     bs_ <<= rhs.size();
     bs_ |= rhs.bs_;
     size_ += rhs.size();
     return *this;
   }
 
   // operator: concatenation copy
   TTBV operator+(const TTBV& rhs) const {
     TTBV lhs(*this);
     return lhs += rhs;
   }
 
   // operator: value increment, overflow protected
   TTBV& operator++() {
     bs_ = std::bitset<S_>(bs_.to_ullong() + 1);
     this->resize(size_);
     return *this;
   }
 
   // manipulation: all bits set to 0
   TTBV& reset() {
     bs_.reset();
     return *this;
   }
 
   // manipulation: all bits set to 1
   TTBV& set() {
     for (int n = 0; n < size_; n++)
       bs_.set(n);
     return *this;
   }
 
   // manipulation: all bits flip 1 to 0 and vice versa
   TTBV& flip() {
     for (int n = 0; n < size_; n++)
       bs_.flip(n);
     return *this;
   }
 
   // manipulation: single bit set to 0
   TTBV& reset(int pos) {
     bs_.reset(pos);
     return *this;
   }
 
   // manipulation: single bit set to 1
   TTBV& set(int pos) {
     bs_.set(pos);
     return *this;
   }
 
   // manipulation: multiple bit set to 1
   TTBV& set(std::vector<int> vpos) {
     for (int pos : vpos)
       bs_.set(pos);
     return *this;
   }
 
   // manipulation: single bit flip 1 to 0 and vice versa
   TTBV& flip(int pos) {
     bs_.flip(pos);
     return *this;
   }
 
   // manipulation: absolute value of biased twos' complement. Converts twos' complenet into binary.
   TTBV& abs() {
     if (twos_) {
       twos_ = false;
       if (this->msb())
         this->flip();
       size_--;
     }
     return *this;
   }
 
   // manipulation: resize
   TTBV& resize(int size) {
     bool msb = this->msb();
     if (size > size_) {
       if (twos_)
         for (int n = size_; n < size; n++)
           bs_.set(n, msb);
       size_ = size;
     } else if (size < size_ && size > 0) {
       this->operator<<=(size - size_);
       if (twos_)
         this->msb() = msb;
     }
     return *this;
   }
 
   // conversion: to string
   std::string str() const { return bs_.to_string().substr(S_ - size_, S_); }
 
   // conversion: range based to string
   std::string str(int start, int end = 0) const { return this->str().substr(size_ - start, size_ - end); }
 
   // conversion: to int
   int val() const { return (twos_ && this->msb()) ? (int)bs_.to_ullong() - iMax() : bs_.to_ullong(); }
 
   // conversion: to int, reinterpret sign
   int val(bool twos) const { return (twos && this->msb()) ? (int)bs_.to_ullong() - iMax() : bs_.to_ullong(); }
 
   // conversion: range based to int, reinterpret sign
   int val(int start, int end = 0, bool twos = false) const { return TTBV(*this, start, end).val(twos); }
 
   // conversion: to double for given precision assuming biased (floor) representation
   double val(double base) const { return (this->val() + .5) * base; }
 
   // conversion: range based to double for given precision assuming biased (floor) representation, reinterpret sign
   double val(double base, int start, int end = 0, bool twos = false) const {
     return (this->val(start, end, twos) + .5) * base;
   }
 
   // maniplulation and conversion: extracts range based to double reinterpret sign and removes these bits
   double extract(double base, int size, bool twos = false) {
     double val = this->val(base, size, 0, twos);
     this->operator>>=(size);
     return val;
   }
 
   // maniplulation and conversion: extracts range based to int reinterpret sign and removes these bits
   int extract(int size, bool twos = false) {
     double val = this->val(size, 0, twos);
     this->operator>>=(size);
     return val;
   }
 
   // manipulation: extracts slice and removes these bits
   TTBV slice(int size, bool twos = false) {
     TTBV ttBV(*this, size, 0, twos);
     this->operator>>=(size);
     return ttBV;
   }
 
   // range based count of '1's or '0's
   int count(int begin, int end, bool b = true) const {
     int c(0);
     for (int i = begin; i < end; i++)
       if (bs_[i] == b)
         c++;
     return c;
   }
 
   // position of least significant '1' or '0'
   int plEncode(bool b = true) const {
     for (int e = 0; e < size_; e++)
       if (bs_[e] == b)
         return e;
     return size_;
   }
 
   // position of most significant '1' or '0'
   int pmEncode(bool b = true) const {
     for (int e = size_ - 1; e > -1; e--)
       if (bs_[e] == b)
         return e;
     return size_;
   }
 
   // position for n'th '1' or '0' counted from least to most significant bit
   int encode(int n, bool b = true) const {
     int sum(0);
     for (int e = 0; e < size_; e++) {
       if (bs_[e] == b) {
         sum++;
         if (sum == n)
           return e;
       }
     }
     return size_;
   }
 
   std::vector<int> ids(bool b = true, bool singed = false) const {
     std::vector<int> v;
     v.reserve(bs_.count());
     for (int i = 0; i < size_; i++)
       if (bs_[i] == b)
         v.push_back(singed ? i + size_ / 2 : i);
     return v;
   }
 
   friend std::ostream& operator<<(std::ostream& os, const TTBV& ttBV) { return os << ttBV.str(); }
 
 private:
   // look up table initializer for powers of 2
   constexpr std::array<unsigned long long int, S_> powersOfTwo() const {
     std::array<unsigned long long int, S_> lut = {};
     for (int i = 0; i < S_; i++)
       lut[i] = std::pow(2, i);
     return lut;
   }
 
   // returns 2 ** size_
   unsigned long long int iMax() const {
     static const std::array<unsigned long long int, S_> lut = powersOfTwo();
     return lut[size_];
   }
 };
 
 #endif

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