FM / hof

/usr/include/boost/hof

Name	Size	Mode	Actions
detail/	-	0755	rm
alias.hpp	5552	0644	edit dl rm
always.hpp	4261	0644	edit dl rm
apply.hpp	8363	0644	edit dl rm
apply_eval.hpp	4428	0644	edit dl rm
arg.hpp	3148	0644	edit dl rm
capture.hpp	5419	0644	edit dl rm
combine.hpp	3877	0644	edit dl rm
compose.hpp	5042	0644	edit dl rm
config.hpp	6149	0644	edit dl rm
construct.hpp	8774	0644	edit dl rm
decay.hpp	1790	0644	edit dl rm
decorate.hpp	6329	0644	edit dl rm
eval.hpp	2400	0644	edit dl rm
first_of.hpp	7100	0644	edit dl rm
fix.hpp	6314	0644	edit dl rm
flip.hpp	2690	0644	edit dl rm
flow.hpp	5060	0644	edit dl rm
fold.hpp	5000	0644	edit dl rm
function.hpp	3129	0644	edit dl rm
function_param_limit.hpp	1658	0644	edit dl rm
identity.hpp	1884	0644	edit dl rm
if.hpp	3314	0644	edit dl rm
implicit.hpp	4041	0644	edit dl rm
indirect.hpp	3268	0644	edit dl rm
infix.hpp	6043	0644	edit dl rm
is_invocable.hpp	1706	0644	edit dl rm
is_unpackable.hpp	3341	0644	edit dl rm
lambda.hpp	6458	0644	edit dl rm
lazy.hpp	8729	0644	edit dl rm
lift.hpp	3752	0644	edit dl rm
limit.hpp	3817	0644	edit dl rm
match.hpp	3331	0644	edit dl rm
mutable.hpp	1988	0644	edit dl rm
pack.hpp	12747	0644	edit dl rm
partial.hpp	8307	0644	edit dl rm
pipable.hpp	6227	0644	edit dl rm
placeholders.hpp	13799	0644	edit dl rm
proj.hpp	7517	0644	edit dl rm
protect.hpp	2145	0644	edit dl rm
repeat.hpp	4184	0644	edit dl rm
repeat_while.hpp	5154	0644	edit dl rm
result.hpp	3644	0644	edit dl rm
returns.hpp	8607	0644	edit dl rm
reveal.hpp	12187	0644	edit dl rm
reverse_fold.hpp	5271	0644	edit dl rm
rotate.hpp	2576	0644	edit dl rm
static.hpp	2395	0644	edit dl rm
tap.hpp	2118	0644	edit dl rm
unpack.hpp	5588	0644	edit dl rm
unpack_sequence.hpp	1810	0644	edit dl rm
version.hpp	679	0644	edit dl rm

Edit: /usr/include/boost/hof/lazy.hpp (8729B)

/*=============================================================================
    Copyright (c) 2014 Paul Fultz II
    lazy.h
    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_HOF_GUARD_FUNCTION_LAZY_H
#define BOOST_HOF_GUARD_FUNCTION_LAZY_H

/// lazy
/// ====
/// 
/// Description
/// -----------
/// 
/// The `lazy` function adaptor returns a function object call wrapper for a
/// function. Calling this wrapper is equivalent to invoking the function. It
/// is a simple form of lambda expressions, but is constexpr friendly. By
/// default, `lazy` captures all of its variables by value, just like `bind`.
/// `std::ref` can be used to capture references instead.
/// 
/// Ultimately, calling `lazy(f)(x)` is the equivalent to calling
/// `std::bind(f, x)` except the lazy version can be called in a constexpr
/// context, as well. The `lazy` adaptor is compatible with `std::bind`, so
/// most of the time `lazy` and `std::bind` can be used interchangeably.
/// 
/// Synopsis
/// --------
/// 
///     template<class F>
///     constexpr lazy_adaptor<F> lazy(F f);
/// 
/// Semantics
/// ---------
/// 
///     assert(lazy(f)(xs...) == std::bind(f, xs...))
///     assert(lazy(f)(xs...)() == f(xs...))
///     assert(lazy(f)(_1)(x) == f(x))
///     assert(lazy(f)(lazy(g)(_1))(x) == f(g(x)))
/// 
/// Requirements
/// ------------
/// 
/// F must be:
/// 
/// * [ConstInvocable](ConstInvocable)
/// * MoveConstructible
/// 
/// Example
/// -------
/// 
///     #include <boost/hof.hpp>
///     #include <cassert>
///     using namespace boost::hof;
/// 
///     int main() {
///         auto add = [](auto x, auto y) { return x+y; };
///         auto increment = lazy(add)(_1, 1);
///         assert(increment(5) == 6);
///     }
/// 
/// References
/// ----------
/// 
/// * [std::bind](http://en.cppreference.com/w/cpp/utility/functional/bind)
///

#include <boost/hof/arg.hpp>
#include <boost/hof/first_of.hpp>
#include <boost/hof/always.hpp>
#include <boost/hof/static.hpp>
#include <boost/hof/detail/delegate.hpp>
#include <boost/hof/detail/compressed_pair.hpp>
#include <boost/hof/pack.hpp>
#include <boost/hof/detail/make.hpp>
#include <boost/hof/detail/static_const_var.hpp>
#include <functional>
#include <type_traits>

namespace boost { namespace hof {

namespace detail {

struct placeholder_transformer
{
    template<class T, typename std::enable_if<(std::is_placeholder<T>::value > 0), int>::type = 0>
    constexpr detail::make_args_f<std::size_t, std::is_placeholder<T>::value> operator()(const T&) const noexcept
    {
        return {};
    }
};

struct bind_transformer
{
    template<class T, typename std::enable_if<std::is_bind_expression<T>::value, int>::type = 0>
    constexpr const T& operator()(const T& x) const noexcept
    {
        return x;
    }
};

struct ref_transformer
{
    template<class T>
    constexpr auto operator()(std::reference_wrapper<T> x) const 
    BOOST_HOF_SFINAE_RETURNS(boost::hof::always_ref(x.get()));
};

struct id_transformer
{
    template<class T>
    constexpr auto operator()(T&& x) const 
    BOOST_HOF_SFINAE_RETURNS(always_detail::always_base<T>(BOOST_HOF_FORWARD(T)(x)));
};

BOOST_HOF_DECLARE_STATIC_VAR(pick_transformer, first_of_adaptor<placeholder_transformer, bind_transformer, ref_transformer, id_transformer>);

template<class T, class Pack>
constexpr auto lazy_transform(T&& x, const Pack& p) BOOST_HOF_RETURNS
(
    p(boost::hof::detail::pick_transformer(BOOST_HOF_FORWARD(T)(x)))
);

template<class F, class Pack>
struct lazy_unpack
{
    const F& f;
    const Pack& p;

constexpr lazy_unpack(const F& fp, const Pack& pp) noexcept
    : f(fp), p(pp)
    {}

template<class... Ts>
    constexpr auto operator()(Ts&&... xs) const BOOST_HOF_RETURNS
    (
        f(lazy_transform(BOOST_HOF_FORWARD(Ts)(xs), p)...)
    );
};

template<class F, class Pack>
constexpr lazy_unpack<F, Pack> make_lazy_unpack(const F& f, const Pack& p) noexcept
{
    return lazy_unpack<F, Pack>(f, p);
}

template<class F, class Pack>
struct lazy_invoker 
: detail::compressed_pair<F, Pack>
{
    typedef detail::compressed_pair<F, Pack> base_type;
    typedef lazy_invoker fit_rewritable1_tag;

#ifdef _MSC_VER
    BOOST_HOF_INHERIT_CONSTRUCTOR(lazy_invoker, base_type)
#else
    BOOST_HOF_INHERIT_DEFAULT_EMPTY(lazy_invoker, base_type)

template<class X, class Y, 
        BOOST_HOF_ENABLE_IF_CONSTRUCTIBLE(base_type, X&&, Y&&)
    >
    constexpr lazy_invoker(X&& x, Y&& y) 
    BOOST_HOF_NOEXCEPT_CONSTRUCTIBLE(base_type, X&&, Y&&)
    : base_type(BOOST_HOF_FORWARD(X)(x), BOOST_HOF_FORWARD(Y)(y))
    {}
#endif

template<class... Ts>
    constexpr const F& base_function(Ts&&... xs) const noexcept
    {
        return this->first(xs...);
    }

template<class... Ts>
    constexpr const Pack& get_pack(Ts&&... xs) const noexcept
    {
        return this->second(xs...);
    }

BOOST_HOF_RETURNS_CLASS(lazy_invoker);

template<class... Ts>
    constexpr auto operator()(Ts&&... xs) const BOOST_HOF_RETURNS
    (
        BOOST_HOF_MANGLE_CAST(const Pack&)(BOOST_HOF_CONST_THIS->get_pack(xs...))(
            boost::hof::detail::make_lazy_unpack(
                BOOST_HOF_MANGLE_CAST(const F&)(BOOST_HOF_CONST_THIS->base_function(xs...)), 
                boost::hof::pack_forward(BOOST_HOF_FORWARD(Ts)(xs)...)
            )
        )
    );
};

template<class F, class Pack>
constexpr lazy_invoker<F, Pack> make_lazy_invoker(F f, Pack pack)
BOOST_HOF_NOEXCEPT_CONSTRUCTIBLE(lazy_invoker<F, Pack>, F&&, Pack&&)
{
    return lazy_invoker<F, Pack>(static_cast<F&&>(f), static_cast<Pack&&>(pack));
}

template<class F>
struct lazy_nullary_invoker : F
{
    BOOST_HOF_INHERIT_CONSTRUCTOR(lazy_nullary_invoker, F);

template<class... Ts>
    constexpr const F& base_function(Ts&&... xs) const noexcept
    {
        return boost::hof::always_ref(*this)(xs...);
    }

BOOST_HOF_RETURNS_CLASS(lazy_nullary_invoker);

template<class... Ts>
    constexpr auto operator()(Ts&&... xs) const BOOST_HOF_RETURNS
    (
        BOOST_HOF_MANGLE_CAST(const F&)(BOOST_HOF_CONST_THIS->base_function(xs...))()
    );
};

template<class F>
constexpr lazy_nullary_invoker<F> make_lazy_nullary_invoker(F f)
BOOST_HOF_NOEXCEPT_CONSTRUCTIBLE(lazy_nullary_invoker<F>, F&&)
{
    return lazy_nullary_invoker<F>(static_cast<F&&>(f));
}
}

template<class F>
struct lazy_adaptor : detail::callable_base<F>
{
    BOOST_HOF_INHERIT_CONSTRUCTOR(lazy_adaptor, detail::callable_base<F>);

template<class... Ts>
    constexpr const detail::callable_base<F>& base_function(Ts&&... xs) const noexcept
    {
        return boost::hof::always_ref(*this)(xs...);
    }

BOOST_HOF_RETURNS_CLASS(lazy_adaptor);

template<class T, class... Ts>
    constexpr auto operator()(T x, Ts... xs) const BOOST_HOF_RETURNS
    (
        boost::hof::detail::make_lazy_invoker(BOOST_HOF_RETURNS_C_CAST(detail::callable_base<F>&&)(BOOST_HOF_CONST_THIS->base_function(x, xs...)), 
            boost::hof::pack_basic(BOOST_HOF_RETURNS_STATIC_CAST(T&&)(x), BOOST_HOF_RETURNS_STATIC_CAST(Ts&&)(xs)...))
    );

// Workaround for gcc 4.7
    template<class Unused=int>
    constexpr detail::lazy_nullary_invoker<F> operator()() const
    BOOST_HOF_RETURNS_DEDUCE_NOEXCEPT(
        boost::hof::detail::make_lazy_nullary_invoker(BOOST_HOF_RETURNS_C_CAST(detail::callable_base<F>&&)(
            BOOST_HOF_CONST_THIS->base_function(BOOST_HOF_RETURNS_CONSTRUCT(Unused)())
        ))
    )
    {
        return boost::hof::detail::make_lazy_nullary_invoker((detail::callable_base<F>&&)(
            this->base_function(Unused())
        ));
    }

// TODO: Overloads to use with ref qualifiers

// template<class... Ts>
    // constexpr auto operator()(Ts... xs) const& BOOST_HOF_RETURNS
    // (
    //     boost::hof::detail::make_lazy_invoker(this->base_function(xs...), 
    //         pack(boost::hof::move(xs)...))
    // );

// template<class... Ts>
    // constexpr auto operator()(Ts... xs) && BOOST_HOF_RETURNS
    // (
    //     boost::hof::detail::make_lazy_invoker((F&&)this->base_function(xs...), 
    //         pack(boost::hof::move(xs)...))
    // );
    
};

BOOST_HOF_DECLARE_STATIC_VAR(lazy, detail::make<lazy_adaptor>);

}} // namespace boost::hof

namespace std {
    template<class F, class Pack>
    struct is_bind_expression<boost::hof::detail::lazy_invoker<F, Pack>>
    : std::true_type
    {};

template<class F>
    struct is_bind_expression<boost::hof::detail::lazy_nullary_invoker<F>>
    : std::true_type
    {};
}

#endif

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