<mp-units/framework/quantity.h>
constexpr
quantity&
operator++() &
requires requires(rep& v) {
{ ++v } -> std::same_as<rep&>;
};
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[[nodiscard]]
constexpr
QuantityOf<quantity_spec> auto
operator++(int)
requires requires(rep& v) {
{ v++ } -> std::common_with<rep>;
};
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