http://reviews.llvm.org/D9044
Files:
include/experimental/algorithm
test/std/experimental/algorithms/alg.random.sample/sample.pass.cpp
test/std/experimental/algorithms/alg.random.sample/sample2.pass.cpp
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Index: include/experimental/algorithm
===================================================================
--- include/experimental/algorithm
+++ include/experimental/algorithm
@@ -0,0 +1,62 @@
+// -*- C++ -*-
+//===-------------------------- algorithm ---------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_EXPERIMENTAL_ALGORITHM
+#define _LIBCPP_EXPERIMENTAL_ALGORITHM
+
+/*
+ experimental/algorithm synopsis
+
+#include <algorithm>
+
+namespace std {
+namespace experimental {
+inline namespace fundamentals_v1 {
+
+template <class ForwardIterator, class Searcher>
+ForwardIterator search(ForwardIterator first, ForwardIterator last,
+ const Searcher &searcher);
+template <class PopulationIterator, class SampleIterator, class Distance,
+ class UniformRandomNumberGenerator>
+SampleIterator sample(PopulationIterator first, PopulationIterator last,
+ SampleIterator out, Distance n,
+ UniformRandomNumberGenerator &&g);
+
+} // namespace fundamentals_v1
+} // namespace experimental
+} // namespace std
+
+*/
+
+#include <experimental/__config>
+#include <algorithm>
+
+_LIBCPP_BEGIN_NAMESPACE_LFTS
+
+template <class _PopulationIterator, class _SampleIterator, class _Distance,
+ class _UniformRandomNumberGenerator>
+_SampleIterator sample(_PopulationIterator __first, _PopulationIterator __last,
+ _SampleIterator __out, _Distance __n,
+ _UniformRandomNumberGenerator &&__g) {
+ _Distance __k = 0;
+ for (; __first != __last && __k < __n; ++__first, (void)++__k)
+ __out[__k] = *__first;
+ _Distance __sz = __k;
+ for (; __first != __last; ++__first, (void)++__k) {
+ _Distance __r = _VSTD::uniform_int_distribution<>(0, __k)(__g);
+ if (__r < __sz)
+ __out[__r] = *__first;
+ }
+ return __out + _VSTD::min(__n, __k);
+}
+
+_LIBCPP_END_NAMESPACE_LFTS
+
+#endif /* _LIBCPP_EXPERIMENTAL_ALGORITHM */
Index: test/std/experimental/algorithms/alg.random.sample/sample.pass.cpp
===================================================================
--- test/std/experimental/algorithms/alg.random.sample/sample.pass.cpp
+++ test/std/experimental/algorithms/alg.random.sample/sample.pass.cpp
@@ -0,0 +1,36 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// template <class PopulationIterator, class SampleIterator, class Distance,
+// class UniformRandomNumberGenerator>
+// SampleIterator sample(PopulationIterator first, PopulationIterator last,
+// SampleIterator out, Distance n,
+// UniformRandomNumberGenerator &&g);
+
+#include <experimental/algorithm>
+#include <random>
+#include <cassert>
+
+int main() {
+ int ia[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+ const unsigned is = sizeof(ia) / sizeof(ia[0]);
+ const unsigned os = 4;
+ int oa[os];
+ int oa1[os] = {10, 5, 9, 4};
+ int oa2[os] = {5, 2, 10, 4};
+ std::minstd_rand g;
+ int * end = std::experimental::sample(ia, ia + is, oa, os, g);
+ assert(end - oa == std::min(os, is));
+ assert(std::equal(oa, oa + os, oa1));
+ end = std::experimental::sample(ia, ia + is, oa, os, g);
+ assert(end - oa == std::min(os, is));
+ assert(std::equal(oa, oa + os, oa2));
+}
Index: test/std/experimental/algorithms/alg.random.sample/sample2.pass.cpp
===================================================================
--- test/std/experimental/algorithms/alg.random.sample/sample2.pass.cpp
+++ test/std/experimental/algorithms/alg.random.sample/sample2.pass.cpp
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// template <class PopulationIterator, class SampleIterator, class Distance,
+// class UniformRandomNumberGenerator>
+// SampleIterator sample(PopulationIterator first, PopulationIterator last,
+// SampleIterator out, Distance n,
+// UniformRandomNumberGenerator &&g);
+
+#include <experimental/algorithm>
+#include <random>
+#include <cassert>
+
+int main() {
+ int ia[] = {1, 2, 3, 4, 5};
+ const unsigned is = sizeof(ia) / sizeof(ia[0]);
+ const unsigned os = 8;
+ int oa[os];
+ int oa1[] = {1, 2, 3, 4, 5};
+ std::minstd_rand g;
+ int *end = std::experimental::sample(ia, ia + is, oa, os, g);
+ assert(end - oa == std::min(os, is));
+ assert(std::equal(oa, end, oa1));
+}
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