description

# getInt64 abstract method

int getInt64(

1. int byteOffset, [
2. Endian endian = Endian.big

])

The (possibly negative) integer represented by the eight bytes at the specified `byteOffset` in this object, in two's complement binary form.

The return value will be between -263 and 263 - 1, inclusive.

The `byteOffset` must be non-negative, and `byteOffset + 8` must be less than or equal to the length of this object.

## Implementation

    int getInt64(int byteOffset, [Endian endian = Endian.big]);