value.hpp

// Copyright (c) 2022 Klemens D. Morgenstern
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_SQLITE_VALUE_HPP
#define BOOST_SQLITE_VALUE_HPP
 
#include <boost/sqlite/detail/config.hpp>
#include <boost/sqlite/blob.hpp>
#include <boost/sqlite/cstring_ref.hpp>
 
 
BOOST_SQLITE_BEGIN_NAMESPACE
 
enum class value_type
{
    integer = SQLITE_INTEGER,
    floating = SQLITE_FLOAT,
    text = SQLITE_TEXT,
    blob = SQLITE_BLOB,
    null = SQLITE_NULL,
};
 
struct value
{
    value_type type() const
    {
        return static_cast<value_type>(sqlite3_value_type(value_));
    }
    int subtype() const
    {
        return sqlite3_value_subtype(value_);
    }
    bool is_null() const
    {
        return type() == value_type::null;
    }
    explicit operator bool () const
    {
        return type() != value_type::null;
    }
    int get_int() const
    {
        return sqlite3_value_int(value_);
    }
    sqlite3_int64 get_int64() const
    {
        return sqlite3_value_int64(value_);
    }
    double get_double() const
    {
        return sqlite3_value_double(value_);
    }
    BOOST_SQLITE_DECL
    cstring_ref get_text() const;
    BOOST_SQLITE_DECL
    blob_view get_blob() const;
 
    value_type numeric_type()  const{return static_cast<value_type>(sqlite3_value_numeric_type(value_));}
 
#if SQLITE_VERSION_NUMBER >= 3032000
    bool nochange() const {return 0 != sqlite3_value_nochange(value_);}
#endif
 
#if SQLITE_VERSION_NUMBER >= 3031000
    bool from_bind() const {return 0 != sqlite3_value_frombind(value_);}
#endif
    explicit value(sqlite3_value * value_) noexcept : value_(value_) {}
 
    using handle_type = sqlite3_value *;
    handle_type handle() const {return value_;}
    handle_type & handle() {return value_;}
 
#if SQLITE_VERSION_NUMBER >= 3020000
    template<typename T>
    T * get_pointer() {return static_cast<T*>(sqlite3_value_pointer(value_, typeid(T).name()));}
#endif
  private:
    sqlite3_value * value_ = nullptr;
};
 
static_assert(sizeof(value) == sizeof(sqlite3_value*), "value must be same as sqlite3_value* pointer");
 
BOOST_SQLITE_END_NAMESPACE
 
#endif //BOOST_SQLITE_VALUE_HPP