std::meta::exception
Defined in header <meta> | ||
|---|---|---|
class exception : public std::exception | (since C++26) |
Defines a type of object to be thrown on failure by reflection functions.
Objects of type std::meta::exception can only be created and accessed in constant evaluation.
Member functions
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(constructor) | constructs a meta::exception object (public member function) |
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what | returns the explanatory string (public member function) |
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u8what | returns the explanatory string as a std::u8string_view (public member function) |
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from | returns the associated std::meta::info object (public member function) |
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where | returns the associated std::source_location (public member function) |
std::meta::exception::exception
consteval exception( std::u8string_view u8what_arg, std::meta::info from,
std::source_location where = std::source_location::current() ) noexcept;
| (1) | |
consteval exception( std::string_view what_arg, std::meta::info from,
std::source_location where = std::source_location::current() ) noexcept;
| (2) | |
consteval exception( const exception& ) = default; | (3) | |
consteval exception( exception&& ) = default; | (4) |
Constructs a new std::meta::info object. Initializes the stored values with the corresponding parameters.
u8what_arg can be represented in the ordinary literal encoding, the explanatory string returned by what() is u8what_arg transcoded from UTF-8 to the ordinary literal encoding; otherwise, a call to what() is not a constant expression.what_arg must be representable in UTF-8.std::meta::exception::what
constexpr const char* what() const noexcept override; |
Returns the explanatory string passed at the time of construction, possibly transcoded from UTF-8 to the ordinary literal encoding.
std::meta::exception::u8what
consteval std::u8string_view u8what() const noexcept; |
Returns the explanatory string passed at the time of construction, possibly transcoded from the ordinary literal encoding to UTF-8.
std::meta::exception::from
consteval std::meta::info from() const noexcept; |
Returns the std::meta::info value passed at the time of construction.
std::meta::exception::where
consteval std::source_location where() const noexcept; |
Returns the std::source_location value passed at the time of construction.
Example
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