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Compile-time performance of printing a prefix improved

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Mateusz Pusz
2019-10-18 22:34:43 +02:00
parent 3c0c98f380
commit 880528e5ca
1 changed files with 9 additions and 8 deletions
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17
src/include/units/format.h
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@@ -47,16 +47,17 @@ namespace units {
void print_prefix_or_ratio(std::basic_ostream<CharT, Traits>& os)
{
if constexpr(Ratio::num != 1 || Ratio::den != 1) {
using prefix = downcast_target<detail::prefix_base<PrefixType, Ratio>>;
if(!std::same_as<PrefixType, no_prefix>) {
using prefix = downcast_target<detail::prefix_base<PrefixType, Ratio>>;
if constexpr(!std::same_as<prefix, prefix_base<PrefixType, Ratio>>) {
// print as a prefixed unit
os << prefix::symbol;
}
else {
// print as a ratio of the coherent unit
print_ratio<Ratio>(os);
if constexpr(!std::same_as<prefix, prefix_base<PrefixType, Ratio>>) {
// print as a prefixed unit
os << prefix::symbol;
return;
}
}
// print as a ratio of the coherent unit
print_ratio<Ratio>(os);
}
}