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libraries/eosiolib/core/eosio/varint.hpp

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Namespaces​

Name
eosio

Classes​

Name
structeosio::unsigned_int
structeosio::signed_int

Detailed Description​

Copyright: defined in eos/LICENSE

Source code​


#pragma once

namespace eosio {
   struct unsigned_int {
       constexpr unsigned_int( uint32_t v = 0 ):value(v){}

       template<typename T>
       constexpr unsigned_int( T v ):value(v){}

       //operator uint32_t()const { return value; }
       //operator uint64_t()const { return value; }

       template<typename T>
       constexpr operator T()const { return static_cast<T>(value); }


       constexpr unsigned_int& operator=( uint32_t v ) { value = v; return *this; }


       uint32_t value;


       constexpr friend bool operator==( const unsigned_int& i, const uint32_t& v ) { return i.value == v; }

       constexpr friend bool operator==( const uint32_t& i, const unsigned_int& v ) { return i == v.value; }

       constexpr friend bool operator==( const unsigned_int& i, const unsigned_int& v ) { return i.value == v.value; }

       constexpr friend bool operator!=( const unsigned_int& i, const uint32_t& v ) { return i.value != v; }

       constexpr friend bool operator!=( const uint32_t& i, const unsigned_int& v ) { return i != v.value; }

       constexpr friend bool operator!=( const unsigned_int& i, const unsigned_int& v ) { return i.value != v.value; }

       constexpr friend bool operator<( const unsigned_int& i, const uint32_t& v ) { return i.value < v; }

       constexpr friend bool operator<( const uint32_t& i, const unsigned_int& v ) { return i < v.value; }

       constexpr friend bool operator<( const unsigned_int& i, const unsigned_int& v ) { return i.value < v.value; }

       constexpr friend bool operator>=( const unsigned_int& i, const uint32_t& v ) { return i.value >= v; }

       constexpr friend bool operator>=( const uint32_t& i, const unsigned_int& v ) { return i >= v.value; }

       constexpr friend bool operator>=( const unsigned_int& i, const unsigned_int& v ) { return i.value >= v.value; }




       template<typename DataStream>
       friend DataStream& operator << ( DataStream& ds, const unsigned_int& v ){
          uint64_t val = v.value;
          do {
             uint8_t b = uint8_t(val) & 0x7f;
             val >>= 7;
             b |= ((val > 0) << 7);
             ds.write((char*)&b,1);//.put(b);
          } while( val );
          return ds;
       }

       template<typename DataStream>
       friend DataStream& operator >> ( DataStream& ds, unsigned_int& vi ){
         uint64_t v = 0; char b = 0; uint8_t by = 0;
         do {
            ds.get(b);
            v |= uint32_t(uint8_t(b) & 0x7f) << by;
            by += 7;
         } while( uint8_t(b) & 0x80 );
         vi.value = static_cast<uint32_t>(v);
         return ds;
       }

   };

   struct signed_int {
       constexpr signed_int( int32_t v = 0 ):value(v){}


       constexpr operator int32_t()const { return value; }


       template<typename T>
       constexpr signed_int& operator=( const T& v ) { value = v; return *this; }

       constexpr signed_int operator++(int) { return value++; }

       constexpr signed_int& operator++(){ ++value; return *this; }


       int32_t value;


       constexpr friend bool operator==( const signed_int& i, const int32_t& v ) { return i.value == v; }

       constexpr friend bool operator==( const int32_t& i, const signed_int& v ) { return i == v.value; }

       constexpr friend bool operator==( const signed_int& i, const signed_int& v ) { return i.value == v.value; }


       constexpr friend bool operator!=( const signed_int& i, const int32_t& v )    { return i.value != v; }

       constexpr friend bool operator!=( const int32_t& i, const signed_int& v ) { return i != v.value; }

       constexpr friend bool operator!=( const signed_int& i, const signed_int& v ) { return i.value != v.value; }

       constexpr friend bool operator<( const signed_int& i, const int32_t& v ) { return i.value < v; }

       constexpr friend bool operator<( const int32_t& i, const signed_int& v ) { return i < v.value; }

       constexpr friend bool operator<( const signed_int& i, const signed_int& v ) { return i.value < v.value; }


       constexpr friend bool operator>=( const signed_int& i, const int32_t& v ) { return i.value >= v; }

       constexpr friend bool operator>=( const int32_t& i, const signed_int& v ) { return i >= v.value; }

       constexpr friend bool operator>=( const signed_int& i, const signed_int& v ) { return i.value >= v.value; }



       template<typename DataStream>
       friend DataStream& operator << ( DataStream& ds, const signed_int& v ){
         uint32_t val = uint32_t((v.value<<1) ^ (v.value>>31));
         do {
            uint8_t b = uint8_t(val) & 0x7f;
            val >>= 7;
            b |= ((val > 0) << 7);
            ds.write((char*)&b,1);//.put(b);
         } while( val );
          return ds;
       }

       template<typename DataStream>
       friend DataStream& operator >> ( DataStream& ds, signed_int& vi ){
         uint32_t v = 0; char b = 0; int by = 0;
         do {
            ds.get(b);
            v |= uint32_t(uint8_t(b) & 0x7f) << by;
            by += 7;
         } while( uint8_t(b) & 0x80 );
         vi.value = (v>>1) ^ (~(v&1)+1ull);
         return ds;
       }

   };
}

Updated on 2022-12-05 at 15:38:08 +0000