namespace System
{
    public static class BitConverter
    {
        // Matching overloads for GetBytes. Copy to the destination span
        // rather than allocating a new byte[].  Return false if the destination
        // span isn't large enough, which can be determined before any copying.
        public static bool TryWriteBytes(Span<byte> destination, bool value);
        public static bool TryWriteBytes(Span<byte> destination, char value);
        public static bool TryWriteBytes(Span<byte> destination, double value);
        public static bool TryWriteBytes(Span<byte> destination, short value);
        public static bool TryWriteBytes(Span<byte> destination, int value);
        public static bool TryWriteBytes(Span<byte> destination, long value);
        public static bool TryWriteBytes(Span<byte> destination, float value);
        public static bool TryWriteBytes(Span<byte> destination, ushort value);
        public static bool TryWriteBytes(Span<byte> destination, uint value);
        public static bool TryWriteBytes(Span<byte> destination, ulong value);

        // Matching overloads for To*.  As with existing To* methods, throw if not
        // enough data in the source span.
        public static bool ToBoolean(ReadOnlySpan<byte> value);
        public static char ToChar(ReadOnlySpan<byte> value);
        public static double ToDouble(ReadOnlySpan<byte> value);
        public static short ToInt16(ReadOnlySpan<byte> value);
        public static int ToInt32(ReadOnlySpan<byte> value);
        public static long ToInt64(ReadOnlySpan<byte> value);
        public static float ToSingle(ReadOnlySpan<byte> value);
        public static ushort ToUInt16(ReadOnlySpan<byte> value);
        public static uint ToUInt32(ReadOnlySpan<byte> value);
        public static ulong ToUInt64(ReadOnlySpan<byte> value);

        …
    }
}