Function select

include/fmt/format.h:1687–1689

template <bool C, typename T, typename F, FMT_ENABLE_IF(C)>
auto select(T true_value, F) -> T {
  return true_value;
}
template <bool C, typename T, typename F, FMT_ENABLE_IF(!C)>
auto select(T, F false_value) -> F {
  return false_value;