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// file : odb/details/function-wrapper.txx
// copyright : Copyright (c) 2009-2019 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#include <utility> // std::swap, std::move
namespace odb
{
namespace details
{
#ifdef ODB_CXX11
template <typename F>
struct caller_impl;
#ifdef ODB_CXX11_VARIADIC_TEMPLATE
template <typename R, typename... A>
struct caller_impl<R (A...)>
{
static R
function (const void* f, A... a)
{
return (*static_cast<const std::function<R (A...)>*> (f)) (a...);
}
};
#else
template <typename R, typename A1>
struct caller_impl<R (A1)>
{
static R
function (const void* f, A1 a1)
{
return (*static_cast<const std::function<R (A1)>*> (f)) (a1);
}
};
template <typename R, typename A1, typename A2>
struct caller_impl<R (A1, A2)>
{
static R
function (const void* f, A1 a1, A2 a2)
{
return (*static_cast<const std::function<R (A1, A2)>*> (f)) (a1, a2);
}
};
#endif
template <typename F>
void
deleter_impl (const void* f)
{
delete static_cast<const std::function<F>*> (f);
}
template <typename F>
template <typename F1>
function_wrapper<F>::
function_wrapper (
F1 f,
typename std::enable_if<!std::is_convertible<F1, F*>::value>::type*)
{
std_function_type sf (std::move (f));
if (F* const* const f = sf.template target<F*> ())
{
function = *f;
deleter = 0;
std_function = 0;
}
else
{
function = reinterpret_cast<F*> (&caller_impl<F>::function);
deleter = &deleter_impl<F>;
std_function = new std_function_type (std::move (sf));
}
}
#endif
template <typename F>
void function_wrapper<F>::
swap (function_wrapper<F>& x)
{
std::swap (function, x.function);
std::swap (deleter, x.deleter);
std::swap (std_function, x.std_function);
}
}
}
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