256‐bit unsigned big integer.
Synopsis
Declared in <arith_uint256.h>
class arith_uint256
: public base_uint<256>Base Classes
Name |
Description |
Template base class for unsigned big integers. |
Member Functions
Name |
Description |
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Constructors |
Assignment operators |
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Numeric ordering, treating the value as an unsigned integer rather than a byte blob. |
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Tests whether the value equals a 64‐bit unsigned number. |
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Encodes the value into the compact difficulty‐target format described above. |
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Hex encoding of the number (with the most significant digits first). |
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Returns the low 64 bits of the value. |
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The "compact" format is a representation of a whole number N using an unsigned 32bit number similar to a floating point format. The most significant 8 bits are the unsigned exponent of base 256. This exponent can be thought of as "number of bytes of N". The lower 23 bits are the mantissa. Bit number 24 (0x800000) represents the sign of N. N = (‐1ˆsign) * mantissa * 256ˆ(exponent‐3) |
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Returns the value as a human‐readable string. |
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Returns the position of the highest bit set plus one, or zero if the value is zero. |
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Converts the value to a double‐precision floating‐point number. |
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Applies a bitwise AND with another big integer in place. |
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Multiplication assignment operators |
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Increment operators |
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Addition assignment operators |
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Returns the two's‐complement negation of the value. |
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Decrement operators |
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Subtraction assignment operators |
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Divides this value by another big integer in place. |
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Shifts the value left by the given number of bits in place. |
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Shifts the value right by the given number of bits in place. |
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Bitwise exclusive‐or assignment operators |
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Bitwise disjunction assignment operators |
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Returns the bitwise complement of the value. |
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Returns the size in bytes of the internal representation. |
Protected Data Members
Name |
Description |
Big integer represented with 32‐bit digits, least‐significant first. |
Friends
Name |
Description |
Converts a uint256 blob to an arithmetic 256‐bit integer. |
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Converts an arithmetic 256‐bit integer to a uint256 blob. |
Non-Member Functions
Name |
Description |
Return the sum of the claimed work on a given set of headers. No verification of PoW is done. |
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Convert nBits value to target. |
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Compute how much work an nBits value corresponds to. |
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Compute how much work a block header corresponds to. |
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Compute how much work a block index entry corresponds to. |
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Returns the bitwise AND of two big integers. |
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Returns the bitwise AND of two big integers. |
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Returns the product of a big integer and a 32‐bit value. |
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Returns the product of a big integer and a 32‐bit value. |
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Returns the product of two big integers. |
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Returns the product of two big integers. |
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Returns the sum of two big integers. |
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Returns the sum of two big integers. |
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Returns the difference of two big integers. |
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Returns the difference of two big integers. |
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Returns the quotient of two big integers. |
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Returns the quotient of two big integers. |
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Returns the value shifted left by a number of bits. |
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Returns the value shifted left by a number of bits. |
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Performs a three‐way comparison of two big integers. |
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Performs a three‐way comparison of two big integers. |
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Tests whether two big integers are equal. |
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Tests whether a big integer equals a 64‐bit value. |
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Tests whether two big integers are equal. |
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Tests whether a big integer equals a 64‐bit value. |
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Returns the value shifted right by a number of bits. |
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Returns the value shifted right by a number of bits. |
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Returns the bitwise XOR of two big integers. |
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Returns the bitwise XOR of two big integers. |
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Returns the bitwise OR of two big integers. |
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Returns the bitwise OR of two big integers. |
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