mirror of
https://github.com/boostorg/hof.git
synced 2026-02-01 08:32:12 +00:00
144 lines
3.6 KiB
C++
144 lines
3.6 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2014 Paul Fultz II
|
|
infix.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 FIT_GUARD_FUNCTION_INFIX_H
|
|
#define FIT_GUARD_FUNCTION_INFIX_H
|
|
|
|
/// infix
|
|
/// =====
|
|
///
|
|
/// Description
|
|
/// -----------
|
|
///
|
|
/// The `infix` function adaptor allows the function to be used as an infix
|
|
/// operator. The operator must be placed inside the angle brackets(ie `<`
|
|
/// and `>`).
|
|
///
|
|
/// Synopsis
|
|
/// --------
|
|
///
|
|
/// template<class F>
|
|
/// constexpr infix_adaptor<F> infix(F f);
|
|
///
|
|
/// Requirements
|
|
/// ------------
|
|
///
|
|
/// F must be:
|
|
///
|
|
/// BinaryFunctionObject
|
|
/// MoveConstructible
|
|
///
|
|
/// Example
|
|
/// -------
|
|
///
|
|
/// struct plus_f
|
|
/// {
|
|
/// template<class T, class U>
|
|
/// T operator()(T x, U y) const
|
|
/// {
|
|
/// return x+y;
|
|
/// }
|
|
/// };
|
|
///
|
|
/// constexpr infix_adaptor<plus_f> plus = {};
|
|
/// int r = 3 <plus> 2;
|
|
/// assert(r == 5);
|
|
///
|
|
|
|
#include <fit/detail/delegate.h>
|
|
#include <fit/returns.h>
|
|
#include <fit/always.h>
|
|
#include <fit/detail/move.h>
|
|
#include <fit/function.h>
|
|
#include <fit/detail/make.h>
|
|
#include <fit/detail/static_const_var.h>
|
|
|
|
namespace fit {
|
|
|
|
namespace detail{
|
|
template<class T, class F>
|
|
struct postfix_adaptor : F
|
|
{
|
|
T x;
|
|
|
|
template<class X, class XF>
|
|
constexpr postfix_adaptor(X&& x, XF&& f)
|
|
: F(fit::forward<XF>(f)), x(fit::forward<X>(x))
|
|
{}
|
|
|
|
template<class... Ts>
|
|
constexpr const F& base_function(Ts&&... xs) const
|
|
{
|
|
return always_ref(*this)(xs...);
|
|
}
|
|
|
|
FIT_RETURNS_CLASS(postfix_adaptor);
|
|
|
|
template<class... Ts>
|
|
constexpr auto operator()(Ts&&... xs) const FIT_RETURNS
|
|
(
|
|
(FIT_MANGLE_CAST(const F&)(FIT_CONST_THIS->base_function(xs...)))(FIT_MANGLE_CAST(T&&)(fit::move(FIT_CONST_THIS->x)), fit::forward<Ts>(xs)...)
|
|
);
|
|
|
|
template<class A>
|
|
constexpr auto operator>(A&& a) const FIT_RETURNS
|
|
(
|
|
(FIT_MANGLE_CAST(const F&)(FIT_CONST_THIS->base_function(a)))(FIT_MANGLE_CAST(T&&)(fit::move(FIT_CONST_THIS->x)), fit::forward<A>(a))
|
|
);
|
|
};
|
|
|
|
template<class T, class F>
|
|
constexpr postfix_adaptor<T, F> make_postfix_adaptor(T&& x, F f)
|
|
{
|
|
return postfix_adaptor<T, F>(fit::forward<T>(x), fit::move(f));
|
|
}
|
|
}
|
|
|
|
template<class F>
|
|
struct infix_adaptor : F
|
|
{
|
|
FIT_INHERIT_CONSTRUCTOR(infix_adaptor, F);
|
|
|
|
template<class... Ts>
|
|
constexpr const F& base_function(Ts&&... xs) const
|
|
{
|
|
return always_ref(*this)(xs...);
|
|
}
|
|
|
|
template<class... Ts>
|
|
constexpr const F& infix_base_function(Ts&&... xs) const
|
|
{
|
|
return always_ref(*this)(xs...);
|
|
}
|
|
|
|
FIT_RETURNS_CLASS(infix_adaptor);
|
|
|
|
template<class... Ts>
|
|
constexpr auto operator()(Ts&&... xs) const FIT_RETURNS
|
|
(
|
|
(FIT_MANGLE_CAST(const F&)(FIT_CONST_THIS->base_function(xs...)))(fit::forward<Ts>(xs)...)
|
|
);
|
|
};
|
|
|
|
template<class T, class F>
|
|
constexpr auto operator<(T&& x, const infix_adaptor<F>& i) FIT_RETURNS
|
|
(detail::make_postfix_adaptor(fit::forward<T>(x), fit::move(i.base_function(x))));
|
|
|
|
// TODO: Operators for static_
|
|
|
|
// Operators for static_function_wrapper adaptor
|
|
template<class T, class F>
|
|
auto operator<(T&& x, const fit::detail::static_function_wrapper<F>& f) FIT_RETURNS
|
|
(
|
|
detail::make_postfix_adaptor(fit::forward<T>(x), fit::move(f.base_function().infix_base_function()))
|
|
);
|
|
|
|
FIT_DECLARE_STATIC_VAR(infix, detail::make<infix_adaptor>);
|
|
|
|
}
|
|
|
|
#endif |