uni20::metadata_value Class Reference

An immutable owned value that retains its native scalar and optional type. More...

#include <metadata.hpp>

Public Member Functions
template<presentation::DataTableValue T>
T	as () const
	Convert without a double intermediate; textual numbers use the destination's parser.
template<typename T >
T const &	get () const
	Access the exact declared type; a mismatch throws std::bad_any_cast.
	metadata_value (char const *text)
	metadata_value (std::string_view text)
template<presentation::DataTableValue T>
	metadata_value (T value)
bool	missing () const
std::string	text (presentation::data_column_display const &format={}, bool machine=false) const
std::type_index	type () const

Detailed Description

An immutable owned value that retains its native scalar and optional type.

Copies share immutable storage. Text views and C strings are copied on entry. Supported types follow presentation::DataTableValue. MPFR values retain their exact/approximate state and precision; conversion to MPFR requires explicit precision.

Constructor & Destructor Documentation

metadata_value() [1/3]

template<presentation::DataTableValue T>

uni20::metadata_value::metadata_value ( T  value )

inline

metadata_value() [2/3]

uni20::metadata_value::metadata_value ( std::string_view  text )

inline

metadata_value() [3/3]

uni20::metadata_value::metadata_value ( char const *  text )

inline

Member Function Documentation

as()

template<presentation::DataTableValue T>

T uni20::metadata_value::as ( ) const

inline

Convert without a double intermediate; textual numbers use the destination's parser.

Integer and half-integer narrowing is checked. Real rounding follows the target type; finite overflow is rejected. A real is never implicitly rounded to an integer.

get()

template<typename T >

T const & uni20::metadata_value::get ( ) const

inline

Access the exact declared type; a mismatch throws std::bad_any_cast.

missing()

bool uni20::metadata_value::missing ( ) const

inline

text()

std::string uni20::metadata_value::text ( presentation::data_column_display const &  format = {}, bool  machine = false  ) const

inline

type()

std::type_index uni20::metadata_value::type ( ) const

inline

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The documentation for this class was generated from the following file:

• metadata.hpp