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std::chrono::month_weekday::ok

From cppreference.com
 
 
Utilities library
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Library feature-test macros (C++20)
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Date and time
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Formatting library (C++20)
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(C++23)
Elementary string conversions
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(C++17)

 
 
 
constexpr bool ok() const noexcept;
(since C++20)

Checks if the contained month and weekday_indexed objects are valid.

[edit] Return value

month().ok() && weekday_indexed().ok()

[edit] Example

#include <cassert>
#include <chrono>
 
int main()
{
    auto mwdi{std::chrono::March/std::chrono::Friday[1]};
    assert(mwdi.ok());
 
    mwdi = {std::chrono::month(17)/std::chrono::Friday[1]}; 
    assert(not mwdi.ok());
 
    mwdi = {std::chrono::March/std::chrono::Friday[-4]}; 
    assert(not mwdi.ok());
}