boost::sqlite::context< Args > Struct Template Reference

A context that can be passed into scalar functions. More...

#include <include/boost/sqlite/function.hpp>

Public Member Functions
template<std::size_t Idx>
auto	get () -> element< Idx > &
	Returns the value in the context at position Idx. Throws if the value isn't set.
connection	get_connection () const
	Returns the connection of the context.
template<std::size_t Idx>
auto	get_if () -> element< Idx > *
	Returns the value in the context at position Idx. Returns nullptr .value isn't set.
template<std::size_t Idx>
void	set (element< Idx > value)
	Set the value in the context at position Idx
void	set_error (cstring_ref message, int code=SQLITE_ERROR)
	Set the an error through the context, instead of throwing it.
template<typename T >
auto	set_result (T &&val)
	Set the result through the context, instead of returning it.

Detailed Description

template<typename ... Args>
struct boost::sqlite::context< Args >

A context that can be passed into scalar functions.

Template Parameters

Args	The argument that can be stored in the context.

extern sqlite::connection conn;
 
sqlite::create_function(
  conn, "my_sum,,
  [](sqlite::context<std::size_t> ctx,
     boost::span<sqlite::value, 1u> args) -> std::size_t
  {
      auto value = args[0].get_int64();
      auto p = ctx.get_if<0>();
      if (p != nullptr) // increment the counter
          return (*p) += value;
      else // set the initial value
          ctx.set<0>(value);
      return value;
  });

Definition at line 53 of file function.hpp.

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The documentation for this struct was generated from the following files:

• boost/sqlite/detail/scalar_function.hpp
• boost/sqlite/function.hpp