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#if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
#include <boost/proto/transform/detail/preprocessed/lazy.hpp>
#elif !defined(BOOST_PP_IS_ITERATING)
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
#pragma wave option(preserve: 2, line: 0, output: "preprocessed/lazy.hpp")
#endif
///////////////////////////////////////////////////////////////////////////////
/// \file lazy.hpp
/// Contains definition of the lazy<> transform.
//
// Copyright 2008 Eric Niebler. 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)
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
#pragma wave option(preserve: 1)
#endif
#define BOOST_PP_ITERATION_PARAMS_1 \
(3, (0, BOOST_PROTO_MAX_ARITY, <boost/proto/transform/detail/lazy.hpp>))
#include BOOST_PP_ITERATE()
#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
#pragma wave option(output: null)
#endif
#else
#define N BOOST_PP_ITERATION()
/// \brief A PrimitiveTransform that uses <tt>make\<\></tt> to build
/// a CallableTransform, and then uses <tt>call\<\></tt> to apply it.
///
/// <tt>lazy\<\></tt> is useful as a higher-order transform, when the
/// transform to be applied depends on the current state of the
/// transformation. The invocation of the <tt>make\<\></tt> transform
/// evaluates any nested transforms, and the resulting type is treated
/// as a CallableTransform, which is evaluated with <tt>call\<\></tt>.
template<typename Object BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)>
struct lazy<Object(BOOST_PP_ENUM_PARAMS(N, A))>
: transform<lazy<Object(BOOST_PP_ENUM_PARAMS(N, A))> >
{
template<typename Expr, typename State, typename Data>
struct impl
: call<
typename make<Object>::template impl<Expr, State, Data>::result_type
(BOOST_PP_ENUM_PARAMS(N, A))
>::template impl<Expr, State, Data>
{};
};
#if N > 0
template<typename Object BOOST_PP_ENUM_TRAILING_PARAMS(N, typename A)>
struct lazy<Object(BOOST_PP_ENUM_PARAMS(N, A)...)>
: transform<lazy<Object(BOOST_PP_ENUM_PARAMS(N, A)...)> >
{
template<typename Expr, typename State, typename Data>
struct impl
: lazy<
typename detail::expand_pattern<
proto::arity_of<Expr>::value
, BOOST_PP_CAT(A, BOOST_PP_DEC(N))
, detail::BOOST_PP_CAT(expand_pattern_rest_, BOOST_PP_DEC(N))<
Object
BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_DEC(N), A)
>
>::type
>::template impl<Expr, State, Data>
{};
};
#endif
#undef N
#endif
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Swift