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Implement LWG-4481 Disallow chrono::duration<const T, P> #6232

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Implement LWG-4481 Disallow chrono::duration<const T, P> #6232

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2 changes: 2 additions & 0 deletions stl/inc/__msvc_chrono.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,8 @@ namespace chrono {
using rep = _Rep;
using period = typename _Period::type;

static_assert(!is_const_v<_Rep>, "rep type of duration must not be a const type");
static_assert(!is_volatile_v<_Rep>, "rep type of duration must not be a volatile type");
static_assert(!_Is_duration_v<_Rep>, "duration can't have duration as first template argument");
static_assert(_Is_ratio_v<_Period>, "period not an instance of std::ratio");
static_assert(0 < _Period::num, "period negative or zero");
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