Returns a representation of the specified floating-point value
according to the IEEE 754 floating-point "double
format" bit layout, preserving Not-a-Number (NaN) values.
<p>Bit 63 (the bit that is selected by the mask
{@code 0x8000000000000000L}) represents the sign of the
floating-point number. Bits
62-52 (the bits that are selected by the mask
{@code 0x7ff0000000000000L}) represent the exponent. Bits 51-0
(the bits that are selected by the mask
{@code 0x000fffffffffffffL}) represent the significand
(sometimes called the mantissa) of the floating-point number.
<p>If the argument is positive infinity, the result is
{@code 0x7ff0000000000000L}.
<p>If the argument is negative infinity, the result is
{@code 0xfff0000000000000L}.
<p>If the argument is NaN, the result is the {@code long}
integer representing the actual NaN value. Unlike the
{@code doubleToLongBits} method,
{@code doubleToRawLongBits} does not collapse all the bit
patterns encoding a NaN to a single "canonical" NaN
value.
<p>In all cases, the result is a {@code long} integer that,
when given to the {@link #longBitsToDouble(long)} method, will
produce a floating-point value the same as the argument to
{@code doubleToRawLongBits}.
@param value a {@code double} precision floating-point number.
@return the bits that represent the floating-point number.
Returns a representation of the specified floating-point value according to the IEEE 754 floating-point "double format" bit layout, preserving Not-a-Number (NaN) values.
<p>Bit 63 (the bit that is selected by the mask {@code 0x8000000000000000L}) represents the sign of the floating-point number. Bits 62-52 (the bits that are selected by the mask {@code 0x7ff0000000000000L}) represent the exponent. Bits 51-0 (the bits that are selected by the mask {@code 0x000fffffffffffffL}) represent the significand (sometimes called the mantissa) of the floating-point number.
<p>If the argument is positive infinity, the result is {@code 0x7ff0000000000000L}.
<p>If the argument is negative infinity, the result is {@code 0xfff0000000000000L}.
<p>If the argument is NaN, the result is the {@code long} integer representing the actual NaN value. Unlike the {@code doubleToLongBits} method, {@code doubleToRawLongBits} does not collapse all the bit patterns encoding a NaN to a single "canonical" NaN value.
<p>In all cases, the result is a {@code long} integer that, when given to the {@link #longBitsToDouble(long)} method, will produce a floating-point value the same as the argument to {@code doubleToRawLongBits}.
@param value a {@code double} precision floating-point number. @return the bits that represent the floating-point number.