public static void Optimized_N_Digits(StringBuilder b, double v, int decimals)
{
long power10 = Power10.Power10Signed64[decimals];
if (v < 0)
{
v = -v; b.Append('-');
} // make v >= 0
var fv = Math.Floor(v);
long i = (long)fv;
long f = (long)Math.Floor((v - fv) * power10 + 0.5);
OptimizedLongFormatter.HeaplessAppend(b, i);
if (decimals > 0 && f != 0)
{
b.Append('.');
for (int d = decimals - OptimizedLongFormatter.GetDigitsCount(f); d > 0; d--)
{
b.Append('0');
}
OptimizedLongFormatter.HeaplessAppend(b, f);
}
else
{
b.Append(".0");
}
}
public unsafe static void Optimized_N_Digits(StringBuilder b, double v, int decimals)
{
long power10 = Power10.Power10Signed64[decimals];
if (v < 0)
{
v = -v; b.Append('-');
}
var fv = Math.Floor(v);
long i = (long)fv;
long f = (long)Math.Floor((v - fv) * power10 + 0.5d);
OptimizedLongFormatter.HeaplessAppend(b, i);
if (decimals > 0 && f != 0)
{
b.Append('.');
char *chars = stackalloc char[decimals];
for (int pos = decimals - 1; pos >= 0; pos--)
{
chars[pos] = (char)(f % 10 + 48);
f = f / 10;
}
if (false)
{
for (int pos = 0; pos < decimals; pos++)
{
b.Append(chars[pos]);
}
}
else
{
int lastDecimal = decimals - 1;
while (lastDecimal > 0 && chars[lastDecimal] == '0')
{
lastDecimal--;
}
for (int pos = 0; pos <= lastDecimal; pos++)
{
b.Append(chars[pos]);
}
}
}
else
{
b.Append(".0");
}
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
if (value == null)
{
writer.WriteNull();
}
else
{
StringBuilder stringBuilder;
if (value is long[] arr)
{
int len = arr.Length;
stringBuilder = new StringBuilder(len << 1);
// for (int pos = 0; pos < len; pos++)
for (int pos = 0; pos < arr.Length; pos++)
{
if (pos != 0)
{
stringBuilder.Append(',');
}
OptimizedLongFormatter.HeaplessAppend(stringBuilder, arr[pos]);
}
}
else if (value is long?[] arrNullable)