sqlpp11/include/sqlpp11/offset.h at postgresql_remove_returning · rbock/sqlpp11 · GitHub

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#pragma once

* Redistribution and use in source and binary forms, with or without modification,

* are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this

* list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice, this

* list of conditions and the following disclaimer in the documentation and/or

* other materials provided with the distribution.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR

* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON

* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <sqlpp11/detail/type_set.h>

#include <sqlpp11/policy_update.h>

#include <sqlpp11/type_traits.h>

namespace sqlpp

{

// OFFSET DATA

template <typename Offset>

struct offset_data_t

{

offset_data_t(Offset value) : _value(value)

{

}

offset_data_t(const offset_data_t&) = default;

offset_data_t(offset_data_t&&) = default;

offset_data_t& operator=(const offset_data_t&) = default;

offset_data_t& operator=(offset_data_t&&) = default;

~offset_data_t() = default;

Offset _value;

};

// OFFSET

template <typename Offset>

struct offset_t

{

using _traits = make_traits<no_value_t, tag::is_offset>;

using _nodes = detail::type_vector<Offset>;

// Data

using _data_t = offset_data_t<Offset>;

// Member implementation with data and methods

template <typename Policies>

struct _impl_t

{

// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069

_impl_t() = default;

_impl_t(const _data_t& data) : _data(data)

{

}

_data_t _data;

};

// Base template to be inherited by the statement

template <typename Policies>

struct _base_t

{

using _data_t = offset_data_t<Offset>;

// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069

template <typename... Args>

_base_t(Args&&... args) : offset{std::forward<Args>(args)...}

{

}

_impl_t<Policies> offset;

_impl_t<Policies>& operator()()

{

return offset;

}

const _impl_t<Policies>& operator()() const

{

return offset;

}

template <typename T>

static auto _get_member(T t) -> decltype(t.offset)

{

return t.offset;

}

using _consistency_check = consistent_t;

};

// DYNAMIC OFFSET DATA

template <typename Database>

struct dynamic_offset_data_t

{

dynamic_offset_data_t() : _value(noop())

{

}

template <typename Offset>

dynamic_offset_data_t(Offset value) : _initialized(true), _value(wrap_operand_t<Offset>(value))

{

}

dynamic_offset_data_t(const dynamic_offset_data_t&) = default;

dynamic_offset_data_t(dynamic_offset_data_t&&) = default;

dynamic_offset_data_t& operator=(const dynamic_offset_data_t&) = default;

dynamic_offset_data_t& operator=(dynamic_offset_data_t&&) = default;

~dynamic_offset_data_t() = default;

bool _initialized = false;

interpretable_t<Database> _value;

};

// DYNAMIC OFFSET

template <typename Database>

struct dynamic_offset_t

{

using _traits = make_traits<no_value_t, tag::is_offset>;

using _nodes = detail::type_vector<>;

// Data

using _data_t = dynamic_offset_data_t<Database>;

// Member implementation with data and methods

template <typename Policies>

struct _impl_t

{

// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069

_impl_t() = default;

_impl_t(const _data_t& data) : _data(data)

{

}

template <typename Offset>

void set(Offset value)

{

// FIXME: Make sure that Offset does not require external tables? Need to read up on SQL

using arg_t = wrap_operand_t<Offset>;

static_assert(is_unsigned_integral_t<arg_t>::value,

"offset requires an unsigned integral value or unsigned integral parameter");

_data._value = arg_t{value};

_data._initialized = true;

}

public:

_data_t _data;

};

// Base template to be inherited by the statement

template <typename Policies>

struct _base_t

{

using _data_t = dynamic_offset_data_t<Database>;

// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069

template <typename... Args>

_base_t(Args&&... args) : offset{std::forward<Args>(args)...}

{

}

_impl_t<Policies> offset;

_impl_t<Policies>& operator()()

{

return offset;

}

const _impl_t<Policies>& operator()() const

{

return offset;

}

template <typename T>

static auto _get_member(T t) -> decltype(t.offset)

{

return t.offset;

}

using _consistency_check = consistent_t;

template <typename Offset>

void set_offset(Offset value)

{

// FIXME: Make sure that Offset does not require external tables? Need to read up on SQL

using arg_t = wrap_operand_t<Offset>;

static_cast<derived_statement_t<Policies>*>(this)->_offset()._value = arg_t{value};

static_cast<derived_statement_t<Policies>*>(this)->_offset()._initialized = true;

}

};

bool _initialized = false;

interpretable_t<Database> _value;

};

SQLPP_PORTABLE_STATIC_ASSERT(assert_offset_is_unsigned_integral,

"argument for offset() must be an integral expressions");

template <typename T>

struct check_offset

{

using type =

static_combined_check_t<static_check_t<is_unsigned_integral_t<T>::value, assert_offset_is_unsigned_integral>>;

};

template <typename T>

using check_offset_t = typename check_offset<wrap_operand_t<T>>::type;

struct no_offset_t

{

using _traits = make_traits<no_value_t, tag::is_noop>;

using _nodes = detail::type_vector<>;

// Data

using _data_t = no_data_t;

// Member implementation with data and methods

template <typename Policies>

struct _impl_t

{

// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069

_impl_t() = default;

_impl_t(const _data_t& data) : _data(data)

{

}

_data_t _data;

};

// Base template to be inherited by the statement

template <typename Policies>

struct _base_t

{

using _data_t = no_data_t;

// workaround for msvc bug https://connect.microsoft.com/VisualStudio/Feedback/Details/2091069

template <typename... Args>

_base_t(Args&&... args) : no_offset{std::forward<Args>(args)...}

{

}

_impl_t<Policies> no_offset;

_impl_t<Policies>& operator()()

{

return no_offset;

}

const _impl_t<Policies>& operator()() const

{

return no_offset;

}

template <typename T>

static auto _get_member(T t) -> decltype(t.no_offset)

{

return t.no_offset;

}

using _database_t = typename Policies::_database_t;

template <typename Check, typename T>

using _new_statement_t = new_statement_t<Check, Policies, no_offset_t, T>;

using _consistency_check = consistent_t;

template <typename Arg>

auto offset(Arg arg) const -> _new_statement_t<check_offset_t<Arg>, offset_t<wrap_operand_t<Arg>>>

{

return _offset_impl(check_offset_t<Arg>{}, wrap_operand_t<Arg>{arg});

}

auto dynamic_offset() const -> _new_statement_t<consistent_t, dynamic_offset_t<_database_t>>

{

static_assert(not std::is_same<_database_t, void>::value,

"dynamic_offset must not be called in a static statement");

return {static_cast<const derived_statement_t<Policies>&>(*this), dynamic_offset_data_t<_database_t>{}};

}

private:

template <typename Check, typename Arg>

auto _offset_impl(Check, Arg arg) const -> inconsistent<Check>;

template <typename Arg>

auto _offset_impl(consistent_t /*unused*/, Arg arg) const -> _new_statement_t<consistent_t, offset_t<Arg>>

{

return {static_cast<const derived_statement_t<Policies>&>(*this), offset_data_t<Arg>{arg}};

}

};

// Interpreters

template <typename Context, typename Offset>

Context& serialize(const offset_data_t<Offset>& t, Context& context)

{

context << " OFFSET ";

serialize_operand(t._value, context);

return context;

}

template <typename Context, typename Database>

Context& serialize(const dynamic_offset_data_t<Database>& t, Context& context)

{

if (t._initialized)

{

context << " OFFSET ";

serialize(t._value, context);

}

return context;

}

template <typename T>

auto offset(T&& t) -> decltype(statement_t<void, no_offset_t>().offset(std::forward<T>(t)))

{

return statement_t<void, no_offset_t>().offset(std::forward<T>(t));

}

template <typename Database>

auto dynamic_offset(const Database & /*unused*/) -> decltype(statement_t<Database, no_offset_t>().dynamic_offset())

{

return statement_t<Database, no_offset_t>().dynamic_offset();

}

} // namespace sqlpp

sqlpp11/include/sqlpp11/offset.h at postgresql_remove_returning · rbock/sqlpp11 · GitHub

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