# setInt64 method

void setInt64 (int byteOffset, int value, [ Endian endian = Endian.big ])
override

Sets the eight bytes starting at the specified `byteOffset` in this object to the two's complement binary representation of the specified `value`, which must fit in eight bytes.

In other words, `value` must lie between -263 and 263 - 1, inclusive.

Throws RangeError if `byteOffset` is negative, or `byteOffset + 8` is greater than the length of this object.

## Implementation

    void setInt64(int byteOffset, int value, [Endian endian = Endian.big]) =>
        _unsupported();