nanodbc::detail Namespace Reference

Implementation details, not part of the interface. More...

Classes
struct	bind_as_optional_string
struct	bind_as_optional_value
struct	bind_as_string
struct	bind_as_value
struct	bind_kind
struct	bind_kind< T, true >
struct	field_type
	The type an accessor yields for a row, stripped of reference and const. More...
struct	is_optional
struct	is_optional< std::optional< T > >

Functions
template<class T >
std::unique_ptr< bool[]>	split_optional (std::vector< std::optional< T > > const &values, std::vector< T > &column)
	Splits optionals into the values themselves and flags saying which are null.
template<class Row , class Member , class Class >
Member const &	read_field (Row const &row, Member Class::*field)
	Reads a member through a pointer to it.
template<class Row , class Accessor >
auto	read_field (Row const &row, Accessor const &accessor) -> decltype(accessor(row))
	Reads a value by calling something with the row.
template<class Rows , class Accessor >
void	bind_column (statement &stmt, short param_index, Rows const &rows, Accessor const &accessor, bind_as_value)
template<class Rows , class Accessor >
void	bind_column (statement &stmt, short param_index, Rows const &rows, Accessor const &accessor, bind_as_string)
template<class Rows , class Accessor , class Column >
std::unique_ptr< bool[]>	gather_optional (Rows const &rows, Accessor const &accessor, Column &column)
template<class Rows , class Accessor >
void	bind_column (statement &stmt, short param_index, Rows const &rows, Accessor const &accessor, bind_as_optional_value)
template<class Rows , class Accessor >
void	bind_column (statement &stmt, short param_index, Rows const &rows, Accessor const &accessor, bind_as_optional_string)
template<class Rows , class Accessor >
void	bind_one (statement &stmt, short param_index, Rows const &rows, Accessor const &accessor)

Variables
template<class T >
constexpr bool	is_optional_v = is_optional<T>::value

Detailed Description

Implementation details, not part of the interface.

Function Documentation

split_optional()

template<class T >

std::unique_ptr< bool[]> nanodbc::detail::split_optional ( std::vector< std::optional< T > > const &  values, std::vector< T > &  column  )

protected

Splits optionals into the values themselves and flags saying which are null.

An absent value still takes up its place in the column, so that the values line up with the flags marking which of them are null. What fills that place is never read.

Parameters

values	The optionals to split.
column	Receives one value per optional, in order.

Returns

One flag per optional, true where the value was absent.