34 lines
887 B
C++
Executable File
34 lines
887 B
C++
Executable File
// Copyright 2015, Tobias Hermann and the FunctionalPlus contributors.
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// https://github.com/Dobiasd/FunctionalPlus
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#pragma once
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#include <iterator>
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#include <utility>
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#include <fplus/compare.hpp>
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#include <fplus/container_common.hpp>
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#include <fplus/internal/invoke.hpp>
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namespace fplus
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{
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namespace internal
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{
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template <typename GroupByCallable, typename F, typename ContainerIn>
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auto group_on_labeled_impl(GroupByCallable group, F f, const ContainerIn& xs)
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{
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const auto grouped = group(is_equal_by(f), xs);
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const auto attach_label = [f](const auto& g)
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{
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using std::begin;
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return std::make_pair(internal::invoke(f, *begin(g)), g);
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};
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return fplus::transform(attach_label, grouped);
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}
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}
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}
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