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Showing content from https://timsong-cpp.github.io/cppwp/n4140/time.traits.duration_values below:

[time.traits.duration_values]

template <class Rep> struct duration_values { public: static constexpr Rep zero(); static constexpr Rep min(); static constexpr Rep max(); };

The duration template uses the duration_values trait to construct special values of the durations representation (Rep). This is done because the representation might be a class type with behavior which requires some other implementation to return these special values. In that case, the author of that class type should specialize duration_values to return the indicated values.

static constexpr Rep zero();

Returns: Rep(0). [ Note: Rep(0) is specified instead of Rep() because Rep() may have some other meaning, such as an uninitialized value.  — end note ]

Remark: The value returned shall be the additive identity.

static constexpr Rep min();

Returns: numeric_limits<Rep>::lowest().

Remark: The value returned shall compare less than or equal to zero().

static constexpr Rep max();

Returns: numeric_limits<Rep>::max().

Remark: The value returned shall compare greater than zero().

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