Replace 'exclude_lambda' with 'filter_map'

In continuation of the deprecation issue thomasmoelhave#196

tpie/CMakeLists.txt

@@ -71,6 +71,7 @@ set (HEADERS
 		pipelining/factory_helpers.h
 		pipelining/file_stream.h
 		pipelining/filter.h
+		pipelining/filter_map.h
 		pipelining/forwarder.h
 		pipelining/helpers.h
 		pipelining/internal_buffer.h

tpie/pipelining/filter_map.h

@@ -0,0 +1,70 @@
+// -*- mode: c++; tab-width: 4; indent-tabs-mode: t; eval: (progn (c-set-style "stroustrup") (c-set-offset 'innamespace 0)); -*-
+// vi:set ts=4 sts=4 sw=4 noet :
+// Copyright 2022 The TPIE development team
+//
+// This file is part of TPIE.
+//
+// TPIE is free software: you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License as published by the
+// Free Software Foundation, either version 3 of the License, or (at your
+// option) any later version.
+//
+// TPIE is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+// License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with TPIE.  If not, see <http://www.gnu.org/licenses/>
+
+#ifndef __TPIE_PIPELINING_FILTER_MAP_H__
+#define __TPIE_PIPELINING_FILTER_MAP_H__
+
+#include <tpie/pipelining/map.h>
+#include <tpie/pipelining/node.h>
+#include <tpie/pipelining/pipe_base.h>
+#include <tpie/pipelining/factory_helpers.h>
+#include <tpie/pipelining/node_name.h>
+
+namespace tpie::pipelining {
+namespace bits {
+
+template <typename dest_t, typename F>
+class filter_map_t: public node {
+private:
+	F functor;
+	dest_t dest;
+
+public:
+	typedef typename std::decay<typename unary_traits<F>::argument_type>::type item_type;
+
+	filter_map_t(dest_t dest, const F & functor):
+    functor(functor), dest(std::move(dest)) {
+		set_name(bits::extract_pipe_name(typeid(F).name()), PRIORITY_NO_NAME);
+	}
+
+	void push(const item_type & item) {
+		typename F::result_type t=f(item);
+		if (t.second) dest.push(t.first);
+	}
+};
+
+} //namespace bits
+
+///////////////////////////////////////////////////////////////////////////////
+/// \brief A pipelining node that applies a functor to items and only keeps
+/// some of them based on the functor's result.
+/// \details The result of the functor must be a pair, e.g.
+/// <tt>std::pair<T,bool></tt>: the second item is a boolean indiciating whether
+/// item should be pushed to the next node while the first one carries the value
+/// itself that is to be pushed.
+/// \param functor The functor that should be applied to items
+///////////////////////////////////////////////////////////////////////////////
+template <typename F, typename = typename std::enable_if<bits::has_argument_type<F>::value>::type>
+pipe_middle<tfactory<bits::filter_map_t, Args<F>, F> > filter_map(const F & functor) {
+  return {functor};
+}
+
+} //namespace terrastream::pipelining
+
+#endif //__TPIE_PIPELINING_FILTER_MAP_H__

tpie/pipelining/std_glue.h

@@ -26,6 +26,7 @@
 #include <tpie/pipelining/pipe_base.h>
 #include <tpie/pipelining/factory_helpers.h>
 #include <tpie/pipelining/map.h>
+#include <tpie/pipelining/filter_map.h>
 
 namespace tpie::pipelining {
 namespace bits {
@@ -101,21 +102,7 @@ template <typename dest_t, typename F>
 using lambda_t [[deprecated("Use 'map_t' in 'tpie/pipelining/map.h'.")]] = map_t<dest_t, F>;
 
 template <typename dest_t, typename F>
-class exclude_lambda_t: public node {
-public:
-	typedef typename F::argument_type item_type;
-
-	exclude_lambda_t(dest_t dest, const F & f): f(f), dest(std::move(dest)) { }
-
-	void push(const item_type & item) {
-		typename F::result_type t=f(item);
-		if (t.second) dest.push(t.first);
-	}
-private:
-	F f;
-	dest_t dest;
-};
-
+using exclude_lambda_t [[deprecated("Use 'filter_map_t' in 'tpie/pipelining/map.h'.")]] = filter_map_t<dest_t, F>;
 
 } // namespace bits
 
@@ -176,6 +163,7 @@ inline pipe_middle<tfactory<bits::lambda_t, Args<F>, F> > lambda(const F & f) {
 /// \param f The functor that should be applied to items
 ///////////////////////////////////////////////////////////////////////////////
 template <typename F>
+[[deprecated("Use 'filter_map' in 'tpie/pipelining/filter_map.h'.")]]
 inline pipe_middle<tfactory<bits::exclude_lambda_t, Args<F>, F> > exclude_lambda(const F & f) {
 	return {f};
 }