interpolator 0.5.0

runtime format strings, fully compatible with std's macros
Documentation 
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format_value! {upper_exp(out, value, UpperExp):
    (None, None, A::None, S::None, false, false) => write!(out, "{value:E}"),
    (None, None, A::None, S::None, false, true) => write!(out, "{value:0E}"),
    (None, None, A::None, S::Plus, false, false) => write!(out, "{value:+E}"),
    (None, None, A::None, S::Plus, false, true) => write!(out, "{value:+0E}"),
    (None, None, A::None, S::Minus, false, false) => write!(out, "{value:-E}"),
    (None, None, A::None, S::Minus, false, true) => write!(out, "{value:-0E}"),
    (None, None, A::Left, S::None, false, false) => write!(out, "{value:<E}"),
    (None, None, A::Left, S::None, false, true) => write!(out, "{value:<0E}"),
    (None, None, A::Left, S::Plus, false, false) => write!(out, "{value:<+E}"),
    (None, None, A::Left, S::Plus, false, true) => write!(out, "{value:<+0E}"),
    (None, None, A::Left, S::Minus, false, false) => write!(out, "{value:<-E}"),
    (None, None, A::Left, S::Minus, false, true) => write!(out, "{value:<-0E}"),
    (None, None, A::Center, S::None, false, false) => write!(out, "{value:^E}"),
    (None, None, A::Center, S::None, false, true) => write!(out, "{value:^0E}"),
    (None, None, A::Center, S::Plus, false, false) => write!(out, "{value:^+E}"),
    (None, None, A::Center, S::Plus, false, true) => write!(out, "{value:^+0E}"),
    (None, None, A::Center, S::Minus, false, false) => write!(out, "{value:^-E}"),
    (None, None, A::Center, S::Minus, false, true) => write!(out, "{value:^-0E}"),
    (None, None, A::Right, S::None, false, false) => write!(out, "{value:>E}"),
    (None, None, A::Right, S::None, false, true) => write!(out, "{value:>0E}"),
    (None, None, A::Right, S::Plus, false, false) => write!(out, "{value:>+E}"),
    (None, None, A::Right, S::Plus, false, true) => write!(out, "{value:>+0E}"),
    (None, None, A::Right, S::Minus, false, false) => write!(out, "{value:>-E}"),
    (None, None, A::Right, S::Minus, false, true) => write!(out, "{value:>-0E}"),
    (None, None, A::None, S::None, true, false) => write!(out, "{value:#E}"),
    (None, None, A::None, S::None, true, true) => write!(out, "{value:#0E}"),
    (None, None, A::None, S::Plus, true, false) => write!(out, "{value:+#E}"),
    (None, None, A::None, S::Plus, true, true) => write!(out, "{value:+#0E}"),
    (None, None, A::None, S::Minus, true, false) => write!(out, "{value:-#E}"),
    (None, None, A::None, S::Minus, true, true) => write!(out, "{value:-#0E}"),
    (None, None, A::Left, S::None, true, false) => write!(out, "{value:<#E}"),
    (None, None, A::Left, S::None, true, true) => write!(out, "{value:<#0E}"),
    (None, None, A::Left, S::Plus, true, false) => write!(out, "{value:<+#E}"),
    (None, None, A::Left, S::Plus, true, true) => write!(out, "{value:<+#0E}"),
    (None, None, A::Left, S::Minus, true, false) => write!(out, "{value:<-#E}"),
    (None, None, A::Left, S::Minus, true, true) => write!(out, "{value:<-#0E}"),
    (None, None, A::Center, S::None, true, false) => write!(out, "{value:^#E}"),
    (None, None, A::Center, S::None, true, true) => write!(out, "{value:^#0E}"),
    (None, None, A::Center, S::Plus, true, false) => write!(out, "{value:^+#E}"),
    (None, None, A::Center, S::Plus, true, true) => write!(out, "{value:^+#0E}"),
    (None, None, A::Center, S::Minus, true, false) => write!(out, "{value:^-#E}"),
    (None, None, A::Center, S::Minus, true, true) => write!(out, "{value:^-#0E}"),
    (None, None, A::Right, S::None, true, false) => write!(out, "{value:>#E}"),
    (None, None, A::Right, S::None, true, true) => write!(out, "{value:>#0E}"),
    (None, None, A::Right, S::Plus, true, false) => write!(out, "{value:>+#E}"),
    (None, None, A::Right, S::Plus, true, true) => write!(out, "{value:>+#0E}"),
    (None, None, A::Right, S::Minus, true, false) => write!(out, "{value:>-#E}"),
    (None, None, A::Right, S::Minus, true, true) => write!(out, "{value:>-#0E}"),
    (None, Some(pr), A::None, S::None, false, false) => write!(out, "{value:.pr$E}"),
    (None, Some(pr), A::None, S::None, false, true) => write!(out, "{value:0.pr$E}"),
    (None, Some(pr), A::None, S::Plus, false, false) => write!(out, "{value:+.pr$E}"),
    (None, Some(pr), A::None, S::Plus, false, true) => write!(out, "{value:+0.pr$E}"),
    (None, Some(pr), A::None, S::Minus, false, false) => write!(out, "{value:-.pr$E}"),
    (None, Some(pr), A::None, S::Minus, false, true) => write!(out, "{value:-0.pr$E}"),
    (None, Some(pr), A::Left, S::None, false, false) => write!(out, "{value:<.pr$E}"),
    (None, Some(pr), A::Left, S::None, false, true) => write!(out, "{value:<0.pr$E}"),
    (None, Some(pr), A::Left, S::Plus, false, false) => write!(out, "{value:<+.pr$E}"),
    (None, Some(pr), A::Left, S::Plus, false, true) => write!(out, "{value:<+0.pr$E}"),
    (None, Some(pr), A::Left, S::Minus, false, false) => write!(out, "{value:<-.pr$E}"),
    (None, Some(pr), A::Left, S::Minus, false, true) => write!(out, "{value:<-0.pr$E}"),
    (None, Some(pr), A::Center, S::None, false, false) => write!(out, "{value:^.pr$E}"),
    (None, Some(pr), A::Center, S::None, false, true) => write!(out, "{value:^0.pr$E}"),
    (None, Some(pr), A::Center, S::Plus, false, false) => write!(out, "{value:^+.pr$E}"),
    (None, Some(pr), A::Center, S::Plus, false, true) => write!(out, "{value:^+0.pr$E}"),
    (None, Some(pr), A::Center, S::Minus, false, false) => write!(out, "{value:^-.pr$E}"),
    (None, Some(pr), A::Center, S::Minus, false, true) => write!(out, "{value:^-0.pr$E}"),
    (None, Some(pr), A::Right, S::None, false, false) => write!(out, "{value:>.pr$E}"),
    (None, Some(pr), A::Right, S::None, false, true) => write!(out, "{value:>0.pr$E}"),
    (None, Some(pr), A::Right, S::Plus, false, false) => write!(out, "{value:>+.pr$E}"),
    (None, Some(pr), A::Right, S::Plus, false, true) => write!(out, "{value:>+0.pr$E}"),
    (None, Some(pr), A::Right, S::Minus, false, false) => write!(out, "{value:>-.pr$E}"),
    (None, Some(pr), A::Right, S::Minus, false, true) => write!(out, "{value:>-0.pr$E}"),
    (None, Some(pr), A::None, S::None, true, false) => write!(out, "{value:#.pr$E}"),
    (None, Some(pr), A::None, S::None, true, true) => write!(out, "{value:#0.pr$E}"),
    (None, Some(pr), A::None, S::Plus, true, false) => write!(out, "{value:+#.pr$E}"),
    (None, Some(pr), A::None, S::Plus, true, true) => write!(out, "{value:+#0.pr$E}"),
    (None, Some(pr), A::None, S::Minus, true, false) => write!(out, "{value:-#.pr$E}"),
    (None, Some(pr), A::None, S::Minus, true, true) => write!(out, "{value:-#0.pr$E}"),
    (None, Some(pr), A::Left, S::None, true, false) => write!(out, "{value:<#.pr$E}"),
    (None, Some(pr), A::Left, S::None, true, true) => write!(out, "{value:<#0.pr$E}"),
    (None, Some(pr), A::Left, S::Plus, true, false) => write!(out, "{value:<+#.pr$E}"),
    (None, Some(pr), A::Left, S::Plus, true, true) => write!(out, "{value:<+#0.pr$E}"),
    (None, Some(pr), A::Left, S::Minus, true, false) => write!(out, "{value:<-#.pr$E}"),
    (None, Some(pr), A::Left, S::Minus, true, true) => write!(out, "{value:<-#0.pr$E}"),
    (None, Some(pr), A::Center, S::None, true, false) => write!(out, "{value:^#.pr$E}"),
    (None, Some(pr), A::Center, S::None, true, true) => write!(out, "{value:^#0.pr$E}"),
    (None, Some(pr), A::Center, S::Plus, true, false) => write!(out, "{value:^+#.pr$E}"),
    (None, Some(pr), A::Center, S::Plus, true, true) => write!(out, "{value:^+#0.pr$E}"),
    (None, Some(pr), A::Center, S::Minus, true, false) => write!(out, "{value:^-#.pr$E}"),
    (None, Some(pr), A::Center, S::Minus, true, true) => write!(out, "{value:^-#0.pr$E}"),
    (None, Some(pr), A::Right, S::None, true, false) => write!(out, "{value:>#.pr$E}"),
    (None, Some(pr), A::Right, S::None, true, true) => write!(out, "{value:>#0.pr$E}"),
    (None, Some(pr), A::Right, S::Plus, true, false) => write!(out, "{value:>+#.pr$E}"),
    (None, Some(pr), A::Right, S::Plus, true, true) => write!(out, "{value:>+#0.pr$E}"),
    (None, Some(pr), A::Right, S::Minus, true, false) => write!(out, "{value:>-#.pr$E}"),
    (None, Some(pr), A::Right, S::Minus, true, true) => write!(out, "{value:>-#0.pr$E}"),
    (Some(wi), None, A::None, S::None, false, false) => write!(out, "{value:wi$E}"),
    (Some(wi), None, A::None, S::None, false, true) => write!(out, "{value:0wi$E}"),
    (Some(wi), None, A::None, S::Plus, false, false) => write!(out, "{value:+wi$E}"),
    (Some(wi), None, A::None, S::Plus, false, true) => write!(out, "{value:+0wi$E}"),
    (Some(wi), None, A::None, S::Minus, false, false) => write!(out, "{value:-wi$E}"),
    (Some(wi), None, A::None, S::Minus, false, true) => write!(out, "{value:-0wi$E}"),
    (Some(wi), None, A::Left, S::None, false, false) => write!(out, "{value:<wi$E}"),
    (Some(wi), None, A::Left, S::None, false, true) => write!(out, "{value:<0wi$E}"),
    (Some(wi), None, A::Left, S::Plus, false, false) => write!(out, "{value:<+wi$E}"),
    (Some(wi), None, A::Left, S::Plus, false, true) => write!(out, "{value:<+0wi$E}"),
    (Some(wi), None, A::Left, S::Minus, false, false) => write!(out, "{value:<-wi$E}"),
    (Some(wi), None, A::Left, S::Minus, false, true) => write!(out, "{value:<-0wi$E}"),
    (Some(wi), None, A::Center, S::None, false, false) => write!(out, "{value:^wi$E}"),
    (Some(wi), None, A::Center, S::None, false, true) => write!(out, "{value:^0wi$E}"),
    (Some(wi), None, A::Center, S::Plus, false, false) => write!(out, "{value:^+wi$E}"),
    (Some(wi), None, A::Center, S::Plus, false, true) => write!(out, "{value:^+0wi$E}"),
    (Some(wi), None, A::Center, S::Minus, false, false) => write!(out, "{value:^-wi$E}"),
    (Some(wi), None, A::Center, S::Minus, false, true) => write!(out, "{value:^-0wi$E}"),
    (Some(wi), None, A::Right, S::None, false, false) => write!(out, "{value:>wi$E}"),
    (Some(wi), None, A::Right, S::None, false, true) => write!(out, "{value:>0wi$E}"),
    (Some(wi), None, A::Right, S::Plus, false, false) => write!(out, "{value:>+wi$E}"),
    (Some(wi), None, A::Right, S::Plus, false, true) => write!(out, "{value:>+0wi$E}"),
    (Some(wi), None, A::Right, S::Minus, false, false) => write!(out, "{value:>-wi$E}"),
    (Some(wi), None, A::Right, S::Minus, false, true) => write!(out, "{value:>-0wi$E}"),
    (Some(wi), None, A::None, S::None, true, false) => write!(out, "{value:#wi$E}"),
    (Some(wi), None, A::None, S::None, true, true) => write!(out, "{value:#0wi$E}"),
    (Some(wi), None, A::None, S::Plus, true, false) => write!(out, "{value:+#wi$E}"),
    (Some(wi), None, A::None, S::Plus, true, true) => write!(out, "{value:+#0wi$E}"),
    (Some(wi), None, A::None, S::Minus, true, false) => write!(out, "{value:-#wi$E}"),
    (Some(wi), None, A::None, S::Minus, true, true) => write!(out, "{value:-#0wi$E}"),
    (Some(wi), None, A::Left, S::None, true, false) => write!(out, "{value:<#wi$E}"),
    (Some(wi), None, A::Left, S::None, true, true) => write!(out, "{value:<#0wi$E}"),
    (Some(wi), None, A::Left, S::Plus, true, false) => write!(out, "{value:<+#wi$E}"),
    (Some(wi), None, A::Left, S::Plus, true, true) => write!(out, "{value:<+#0wi$E}"),
    (Some(wi), None, A::Left, S::Minus, true, false) => write!(out, "{value:<-#wi$E}"),
    (Some(wi), None, A::Left, S::Minus, true, true) => write!(out, "{value:<-#0wi$E}"),
    (Some(wi), None, A::Center, S::None, true, false) => write!(out, "{value:^#wi$E}"),
    (Some(wi), None, A::Center, S::None, true, true) => write!(out, "{value:^#0wi$E}"),
    (Some(wi), None, A::Center, S::Plus, true, false) => write!(out, "{value:^+#wi$E}"),
    (Some(wi), None, A::Center, S::Plus, true, true) => write!(out, "{value:^+#0wi$E}"),
    (Some(wi), None, A::Center, S::Minus, true, false) => write!(out, "{value:^-#wi$E}"),
    (Some(wi), None, A::Center, S::Minus, true, true) => write!(out, "{value:^-#0wi$E}"),
    (Some(wi), None, A::Right, S::None, true, false) => write!(out, "{value:>#wi$E}"),
    (Some(wi), None, A::Right, S::None, true, true) => write!(out, "{value:>#0wi$E}"),
    (Some(wi), None, A::Right, S::Plus, true, false) => write!(out, "{value:>+#wi$E}"),
    (Some(wi), None, A::Right, S::Plus, true, true) => write!(out, "{value:>+#0wi$E}"),
    (Some(wi), None, A::Right, S::Minus, true, false) => write!(out, "{value:>-#wi$E}"),
    (Some(wi), None, A::Right, S::Minus, true, true) => write!(out, "{value:>-#0wi$E}"),
    (Some(wi), Some(pr), A::None, S::None, false, false) => write!(out, "{value:wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::None, false, true) => write!(out, "{value:0wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::Plus, false, false) => write!(out, "{value:+wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::Plus, false, true) => write!(out, "{value:+0wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::Minus, false, false) => write!(out, "{value:-wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::Minus, false, true) => write!(out, "{value:-0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::None, false, false) => write!(out, "{value:<wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::None, false, true) => write!(out, "{value:<0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::Plus, false, false) => write!(out, "{value:<+wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::Plus, false, true) => write!(out, "{value:<+0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::Minus, false, false) => write!(out, "{value:<-wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::Minus, false, true) => write!(out, "{value:<-0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::None, false, false) => write!(out, "{value:^wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::None, false, true) => write!(out, "{value:^0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::Plus, false, false) => write!(out, "{value:^+wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::Plus, false, true) => write!(out, "{value:^+0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::Minus, false, false) => write!(out, "{value:^-wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::Minus, false, true) => write!(out, "{value:^-0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::None, false, false) => write!(out, "{value:>wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::None, false, true) => write!(out, "{value:>0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::Plus, false, false) => write!(out, "{value:>+wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::Plus, false, true) => write!(out, "{value:>+0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::Minus, false, false) => write!(out, "{value:>-wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::Minus, false, true) => write!(out, "{value:>-0wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::None, true, false) => write!(out, "{value:#wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::None, true, true) => write!(out, "{value:#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::Plus, true, false) => write!(out, "{value:+#wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::Plus, true, true) => write!(out, "{value:+#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::Minus, true, false) => write!(out, "{value:-#wi$.pr$E}"),
    (Some(wi), Some(pr), A::None, S::Minus, true, true) => write!(out, "{value:-#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::None, true, false) => write!(out, "{value:<#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::None, true, true) => write!(out, "{value:<#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::Plus, true, false) => write!(out, "{value:<+#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::Plus, true, true) => write!(out, "{value:<+#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::Minus, true, false) => write!(out, "{value:<-#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Left, S::Minus, true, true) => write!(out, "{value:<-#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::None, true, false) => write!(out, "{value:^#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::None, true, true) => write!(out, "{value:^#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::Plus, true, false) => write!(out, "{value:^+#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::Plus, true, true) => write!(out, "{value:^+#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::Minus, true, false) => write!(out, "{value:^-#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Center, S::Minus, true, true) => write!(out, "{value:^-#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::None, true, false) => write!(out, "{value:>#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::None, true, true) => write!(out, "{value:>#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::Plus, true, false) => write!(out, "{value:>+#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::Plus, true, true) => write!(out, "{value:>+#0wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::Minus, true, false) => write!(out, "{value:>-#wi$.pr$E}"),
    (Some(wi), Some(pr), A::Right, S::Minus, true, true) => write!(out, "{value:>-#0wi$.pr$E}"),
}