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/placeholders.hpp (13799B)

/*=============================================================================
    Copyright (c) 2014 Paul Fultz II
    placeholders.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_PLACEHOLDERS_H
#define BOOST_HOF_GUARD_FUNCTION_PLACEHOLDERS_H

/// placeholders
/// ============
/// 
/// Description
/// -----------
/// 
/// The placeholders provide `std::bind` compatible placeholders that
/// additionally provide basic C++ operators that creates bind expressions.
/// Each bind expression supports `constexpr` function evaluation.
/// 
/// Synopsis
/// --------
/// 
///     namespace placeholders {
///         placeholder<1> _1 = {};
///         placeholder<2> _2 = {};
///         placeholder<3> _3 = {};
///         placeholder<4> _4 = {};
///         placeholder<5> _5 = {};
///         placeholder<6> _6 = {};
///         placeholder<7> _7 = {};
///         placeholder<8> _8 = {};
///         placeholder<9> _9 = {};
///     }
/// 
/// Operators
/// ---------
/// 
/// * Binary operators: +,-,*,/,%,>>,<<,>,<,<=,>=,==,!=,&,^,|,&&,||
/// * Assign operators: +=,-=,*=,/=,%=,>>=,<<=,&=,|=,^=
/// * Unary operators: !,~,+,-,*,++,--
/// 
/// 
/// Example
/// -------
/// 
///     #include <boost/hof.hpp>
///     #include <cassert>
///     using namespace boost::hof;
/// 
///     int main() {
///         auto sum = _1 + _2;
///         assert(3 == sum(1, 2));
///     }
/// 
/// 
/// unamed placeholder
/// ==================
/// 
/// Description
/// -----------
/// 
/// The unamed placeholder can be used to build simple functions from C++
/// operators. 
/// 
/// Note: The function produced by the unamed placeholder is not a bind expression.
/// 
/// Synopsis
/// --------
/// 
///     namespace placeholders {
///         /* unspecified */ _ = {};
///     }
/// 
/// Example
/// -------
/// 
///     #include <boost/hof.hpp>
///     #include <cassert>
///     using namespace boost::hof;
/// 
///     int main() {
///         auto sum = _ + _;
///         assert(3 == sum(1, 2));
///     }
///

#include <boost/hof/returns.hpp>
#include <boost/hof/lazy.hpp>
#include <boost/hof/protect.hpp>

#if defined(_MSC_VER) && _MSC_VER >= 1910
#include <boost/hof/detail/pp.hpp>
#endif

namespace boost { namespace hof { namespace detail {
    template<int N>
    struct simple_placeholder
    {};
}}} // namespace boost::hof

namespace std {
    template<int N>
    struct is_placeholder<boost::hof::detail::simple_placeholder<N>>
    : std::integral_constant<int, N>
    {};
}

namespace boost { namespace hof {

#define BOOST_HOF_FOREACH_BINARY_OP(m) \
    m(+, add) \
    m(-, subtract) \
    m(*, multiply) \
    m(/, divide) \
    m(%, remainder) \
    m(>>, shift_right) \
    m(<<, shift_left) \
    m(>, greater_than) \
    m(<, less_than) \
    m(<=, less_than_equal) \
    m(>=, greater_than_equal) \
    m(==, equal) \
    m(!=, not_equal) \
    m(&, bit_and) \
    m(^, xor_) \
    m(|, bit_or) \
    m(&&, and_) \
    m(||, or_)

#define BOOST_HOF_FOREACH_ASSIGN_OP(m) \
    m(+=, assign_add) \
    m(-=, assign_subtract) \
    m(*=, assign_multiply) \
    m(/=, assign_divide) \
    m(%=, assign_remainder) \
    m(>>=, assign_right_shift) \
    m(<<=, assign_left_shift) \
    m(&=, assign_bit_and) \
    m(|=, assign_bit_or) \
    m(^=, assign_xor)

#ifndef _MSC_VER
#define BOOST_HOF_FOREACH_UNARY_OP(m) \
    m(!, not_) \
    m(~, compl_) \
    m(+, unary_plus) \
    m(-, unary_subtract) \
    m(*, dereference) \
    m(++, increment) \
    m(--, decrement)
#else
#define BOOST_HOF_FOREACH_UNARY_OP(m) \
    m(!, not_) \
    m(~, compl_) \
    m(+, unary_plus) \
    m(-, unary_subtract) \
    m(*, dereference)
#endif

namespace operators {

struct call
{
    template<class F, class... Ts>
    constexpr auto operator()(F&& f, Ts&&... xs) const BOOST_HOF_RETURNS
    (f(BOOST_HOF_FORWARD(Ts)(xs)...));
};

// MSVC 2017 ICEs on && and || in conxtexpr, so we fallback on bitwise operators
#if defined(_MSC_VER) && _MSC_VER >= 1910
#define BOOST_HOF_BINARY_OP_SKIP_and_ ()
#define BOOST_HOF_BINARY_OP_SKIP_or_ ()

struct and_
{
    template<class T, class U>
    constexpr auto operator()(T&& x, U&& y) const 
    noexcept(noexcept(BOOST_HOF_FORWARD(T)(x) && BOOST_HOF_FORWARD(U)(y)))
    -> decltype(BOOST_HOF_FORWARD(T)(x) && BOOST_HOF_FORWARD(U)(y)) 
    { return BOOST_HOF_FORWARD(T)(x) & BOOST_HOF_FORWARD(U)(y); }
};

struct or_
{
    template<class T, class U>
    constexpr auto operator()(T&& x, U&& y) const 
    noexcept(noexcept(BOOST_HOF_FORWARD(T)(x) || BOOST_HOF_FORWARD(U)(y)))
    -> decltype(BOOST_HOF_FORWARD(T)(x) || BOOST_HOF_FORWARD(U)(y)) 
    { return BOOST_HOF_FORWARD(T)(x) | BOOST_HOF_FORWARD(U)(y); }
};

#define BOOST_HOF_BINARY_OP_IMPL(op, name) \
    struct name \
    { \
        template<class T, class U> \
        BOOST_HOF_USING(ex_failure, decltype(std::declval<T>() op std::declval<U>())); \
        struct failure : as_failure<ex_failure> {}; \
        template<class T, class U> \
        constexpr auto operator()(T&& x, U&& y) const BOOST_HOF_RETURNS \
        (BOOST_HOF_FORWARD(T)(x) op BOOST_HOF_FORWARD(U)(y)); \
    };

#define BOOST_HOF_BINARY_OP(op, name) \
    BOOST_HOF_PP_IIF(BOOST_HOF_PP_IS_PAREN(BOOST_HOF_PP_CAT(BOOST_HOF_BINARY_OP_SKIP_, name))) \
    (BOOST_HOF_PP_EMPTY, BOOST_HOF_BINARY_OP_IMPL)(op, name)

#else

#define BOOST_HOF_BINARY_OP(op, name) \
    struct name \
    { \
        template<class T, class U> \
        constexpr auto operator()(T&& x, U&& y) const BOOST_HOF_RETURNS \
        (BOOST_HOF_FORWARD(T)(x) op BOOST_HOF_FORWARD(U)(y)); \
    };

#endif

BOOST_HOF_FOREACH_BINARY_OP(BOOST_HOF_BINARY_OP)
BOOST_HOF_FOREACH_ASSIGN_OP(BOOST_HOF_BINARY_OP)

#define BOOST_HOF_UNARY_OP(op, name) \
    struct name \
    { \
        template<class T> \
        constexpr auto operator()(T&& x) const BOOST_HOF_RETURNS \
        (op(BOOST_HOF_FORWARD(T)(x))); \
    };

BOOST_HOF_FOREACH_UNARY_OP(BOOST_HOF_UNARY_OP)

}

template<int N>
struct placeholder
{
#if BOOST_HOF_HAS_MANGLE_OVERLOAD
    template<class... Ts>
    constexpr auto operator()(Ts&&... xs) const BOOST_HOF_RETURNS 
    ( boost::hof::lazy(operators::call())(detail::simple_placeholder<N>(), BOOST_HOF_FORWARD(Ts)(xs)...) );
#else
    template<class... Ts>
    struct result_call
    { typedef decltype(boost::hof::lazy(operators::call())(detail::simple_placeholder<N>(), std::declval<Ts>()...)) type; };
    template<class... Ts>
    constexpr typename result_call<Ts...>::type operator()(Ts&&... xs) const 
    { return boost::hof::lazy(operators::call())(detail::simple_placeholder<N>(), BOOST_HOF_FORWARD(Ts)(xs)...); };

#endif

#define BOOST_HOF_PLACEHOLDER_UNARY_OP(op, name) \
    constexpr auto operator op () const BOOST_HOF_RETURNS \
    ( boost::hof::lazy(operators::name())(detail::simple_placeholder<N>()) );

BOOST_HOF_FOREACH_UNARY_OP(BOOST_HOF_PLACEHOLDER_UNARY_OP)

#define BOOST_HOF_PLACEHOLDER_ASSIGN_OP(op, name) \
    template<class T> \
    constexpr auto operator op (T&& x) const BOOST_HOF_RETURNS \
    ( boost::hof::lazy(operators::name())(detail::simple_placeholder<N>(), BOOST_HOF_FORWARD(T)(x)) );

BOOST_HOF_FOREACH_ASSIGN_OP(BOOST_HOF_PLACEHOLDER_ASSIGN_OP)

};

#if BOOST_HOF_HAS_MANGLE_OVERLOAD

#define BOOST_HOF_PLACEHOLDER_BINARY_OP(op, name) \
    template<class T, int N> \
    constexpr inline auto operator op (const placeholder<N>&, T&& x) BOOST_HOF_RETURNS \
    ( boost::hof::lazy(operators::name())(detail::simple_placeholder<N>(), BOOST_HOF_FORWARD(T)(x)) ); \
    template<class T, int N> \
    constexpr inline auto operator op (T&& x, const placeholder<N>&) BOOST_HOF_RETURNS \
    ( boost::hof::lazy(operators::name())(BOOST_HOF_FORWARD(T)(x), detail::simple_placeholder<N>()) ); \
    template<int N, int M> \
    constexpr inline auto operator op (const placeholder<N>&, const placeholder<M>&) BOOST_HOF_RETURNS \
    ( boost::hof::lazy(operators::name())(detail::simple_placeholder<N>(), detail::simple_placeholder<M>()) );

#else

#define BOOST_HOF_PLACEHOLDER_BINARY_OP(op, name) \
    template<class T, class U> \
    struct result_ ## name \
    { typedef decltype(boost::hof::lazy(operators::name())(std::declval<T>(), std::declval<U>())) type; }; \
    template<class T, int N> \
    constexpr inline typename result_ ## name<detail::simple_placeholder<N>, T>::type operator op (const placeholder<N>&, T&& x) \
    { return boost::hof::lazy(operators::name())(detail::simple_placeholder<N>(), BOOST_HOF_FORWARD(T)(x)); } \
    template<class T, int N> \
    constexpr inline typename result_ ## name<T, detail::simple_placeholder<N>>::type operator op (T&& x, const placeholder<N>&) \
    { return boost::hof::lazy(operators::name())(BOOST_HOF_FORWARD(T)(x), detail::simple_placeholder<N>()); } \
    template<int N, int M> \
    constexpr inline typename result_ ## name<detail::simple_placeholder<N>, detail::simple_placeholder<M>>::type operator op (const placeholder<N>&, const placeholder<M>&) \
    { return boost::hof::lazy(operators::name())(detail::simple_placeholder<N>(), detail::simple_placeholder<M>()); }

#endif

BOOST_HOF_FOREACH_BINARY_OP(BOOST_HOF_PLACEHOLDER_BINARY_OP)

namespace placeholders {
BOOST_HOF_DECLARE_STATIC_VAR(_1, placeholder<1>);
BOOST_HOF_DECLARE_STATIC_VAR(_2, placeholder<2>);
BOOST_HOF_DECLARE_STATIC_VAR(_3, placeholder<3>);
BOOST_HOF_DECLARE_STATIC_VAR(_4, placeholder<4>);
BOOST_HOF_DECLARE_STATIC_VAR(_5, placeholder<5>);
BOOST_HOF_DECLARE_STATIC_VAR(_6, placeholder<6>);
BOOST_HOF_DECLARE_STATIC_VAR(_7, placeholder<7>);
BOOST_HOF_DECLARE_STATIC_VAR(_8, placeholder<8>);
BOOST_HOF_DECLARE_STATIC_VAR(_9, placeholder<9>);
}

using placeholders::_1;
using placeholders::_2;
using placeholders::_3;
using placeholders::_4;
using placeholders::_5;
using placeholders::_6;
using placeholders::_7;
using placeholders::_8;
using placeholders::_9;

namespace detail {

struct unamed_placeholder
{
template<class T, class Invoker>
struct partial_ap
{
    T val;

BOOST_HOF_INHERIT_DEFAULT_EMPTY(partial_ap, T)

template<class X, class... Xs, BOOST_HOF_ENABLE_IF_CONSTRUCTIBLE(T, X&&, Xs&&...)>
    constexpr partial_ap(X&& x, Xs&&... xs) : val(BOOST_HOF_FORWARD(X)(x), BOOST_HOF_FORWARD(Xs)(xs)...)
    {}

BOOST_HOF_RETURNS_CLASS(partial_ap);

struct partial_ap_failure
    {
        template<class Failure>
        struct apply
        {
            template<class... Xs>
            struct of;

template<class X>
            struct of<X>
            : Failure::template of<typename std::add_const<T>::type, X>
            {};
        };
    };

struct failure
    : failure_map<partial_ap_failure, Invoker>
    {};

template<class X>
    constexpr BOOST_HOF_SFINAE_RESULT(const Invoker&, id_<T>, id_<X>) 
    operator()(X&& x) const BOOST_HOF_SFINAE_RETURNS
    (
        Invoker()(BOOST_HOF_CONST_THIS->val, BOOST_HOF_FORWARD(X)(x))
    );
};

template<class Invoker, class T>
static constexpr partial_ap<T, Invoker> make_partial_ap(T&& x)
{
    return {BOOST_HOF_FORWARD(T)(x)};
}

template<class Op>
struct left
{
    struct failure
    : failure_for<Op>
    {};
    template<class T, class X>
    constexpr BOOST_HOF_SFINAE_RESULT(const Op&, id_<T>, id_<X>) 
    operator()(T&& val, X&& x) const BOOST_HOF_SFINAE_RETURNS
    (Op()(BOOST_HOF_FORWARD(T)(val), BOOST_HOF_FORWARD(X)(x)));
};

template<class Op>
struct right
{
    struct right_failure
    {
        template<class Failure>
        struct apply
        {
            template<class T, class U, class... Ts>
            struct of
            : Failure::template of<U, T, Ts...>
            {};
        };
    };

struct failure
    : failure_map<right_failure, Op>
    {};

template<class T, class X>
    constexpr BOOST_HOF_SFINAE_RESULT(const Op&, id_<X>, id_<T>) 
    operator()(T&& val, X&& x) const BOOST_HOF_SFINAE_RETURNS
    (Op()(BOOST_HOF_FORWARD(X)(x), BOOST_HOF_FORWARD(T)(val)));
};

#define BOOST_HOF_UNAMED_PLACEHOLDER_UNARY_OP(op, name) \
    constexpr auto operator op () const BOOST_HOF_RETURNS \
    ( operators::name() );

BOOST_HOF_FOREACH_UNARY_OP(BOOST_HOF_UNAMED_PLACEHOLDER_UNARY_OP)

#define BOOST_HOF_UNAMED_PLACEHOLDER_ASSIGN_OP(op, name) \
    template<class T> \
    constexpr auto operator op (const T& x) const BOOST_HOF_RETURNS \
    ( partial_ap<T, left<operators::name>>(x) );

BOOST_HOF_FOREACH_ASSIGN_OP(BOOST_HOF_UNAMED_PLACEHOLDER_ASSIGN_OP)
};
#define BOOST_HOF_UNAMED_PLACEHOLDER_BINARY_OP(op, name) \
    template<class T> \
    constexpr inline auto operator op (const unamed_placeholder&, const T& x) BOOST_HOF_RETURNS \
    ( unamed_placeholder::make_partial_ap<unamed_placeholder::right<operators::name>>(boost::hof::decay(x)) ); \
    template<class T> \
    constexpr inline auto operator op (const T& x, const unamed_placeholder&) BOOST_HOF_RETURNS \
    ( unamed_placeholder::make_partial_ap<unamed_placeholder::left<operators::name>>(boost::hof::decay(x)) ); \
    constexpr inline auto operator op (const unamed_placeholder&, const unamed_placeholder&) BOOST_HOF_RETURNS \
    ( operators::name() );

BOOST_HOF_FOREACH_BINARY_OP(BOOST_HOF_UNAMED_PLACEHOLDER_BINARY_OP)
}

namespace placeholders {
BOOST_HOF_DECLARE_STATIC_VAR(_, detail::unamed_placeholder);
}

using placeholders::_;

}} // namespace boost::hof

namespace std {
    template<int N>
    struct is_placeholder<boost::hof::placeholder<N>>
    : std::integral_constant<int, N>
    {};
}

namespace boost {

template<class T> 
    struct is_placeholder;

template<int N>
    struct is_placeholder<boost::hof::placeholder<N>>
    : std::integral_constant<int, N>
    {};

}

#endif

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