summaryrefslogtreecommitdiff
path: root/absl/random/internal/uniform_helper.h
diff options
context:
space:
mode:
authorGravatar Abseil Team <absl-team@google.com>2019-08-08 10:56:58 -0700
committerGravatar CJ Johnson <johnsoncj@google.com>2019-08-08 14:19:45 -0400
commitaa844899c937bde5d2b24f276b59997e5b668bde (patch)
treecd18e64150abc74b85bbbf6abf990f66fa47cacd /absl/random/internal/uniform_helper.h
parentfcb104594b0bb4b8ac306cb2f55ecdad40974683 (diff)
Creation of LTS branch "lts_2019_08_08"20190808
- 9ee91d3e430fb33a4590486573792eb0fa146c2d Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 8efba58a3b656e9b41fb0471ae6453425a61c520 Export of internal Abseil changes by Abseil Team <absl-team@google.com> - b49b8d16b67ec6912899684b732e6367f258cfdb Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 67222ffc4c83d918ce8395aa61769eeb77df4c4d Export of internal Abseil changes by Abseil Team <absl-team@google.com> - c5c4db4f5191fe5e76cbf68dcc71fb28702f7d2b Export of internal Abseil changes by Abseil Team <absl-team@google.com> - 14550beb3b7b97195e483fb74b5efb906395c31e Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 52e88ee56b72cf32bc66534d942c7398ce481331 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 36d37ab992038f52276ca66b9da80c1cf0f57dc2 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - ad1485c8986246b2ae9105e512738d0e97aec887 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - f3840bc5e33ce4932e35986cf3718450c6f02af2 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 278b26058c036833a4f7f3047d3f4d9296527f87 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - c6c3c1b498e4ee939b24be59cae29d59c3863be8 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 44efe96dfca674a17b45ca53fc77fb69f1e29bf4 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 3c98fcc0461bd2a4b9c149d4748a7373a225cf4b Merge pull request #340 from jtsylve/macos_cxx17_fix by Matt Calabrese <38107210+mattcalabrese-google@users.noreply.github.com> - 74d91756c11bc22f9b0108b94da9326f7f9e376f Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - e6b050212c859fbaf67abac76105da10ec348274 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - c964fcffac27bd4a9ff67fe393410dd1146ef8b8 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 72e09a54d993b192db32be14c65adf7e9bd08c31 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - d65e19dfcd8697076f68598c0131c6930cdcd74d Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 5162fc83d2f3b79a9753ed59594c43966afdd37a Merge pull request #336 from shields/patch-2 by Shaindel Schwartz <31392632+shaindelschwartz@users.noreply.github.com> - 0389f7bf58fa41f35b3ad60be61d32f31e4f8ed6 Merge pull request #335 from shields/patch-1 by Shaindel Schwartz <31392632+shaindelschwartz@users.noreply.github.com> - e9324d926a9189e222741fce6e676f0944661a72 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 43ef2148c0936ebf7cb4be6b19927a9d9d145b8f Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - a13d3df2b3ba68aeead92e2d078fba0510d55024 Merge pull request #323 from gosnik/master by Gennadiy Rozental <rogeeff@google.com> - 310a11865c97c5cdcc42a4ee2c2e3578423afe69 Merge pull request #324 from RasPat1/patch-1 by Gennadiy Rozental <rogeeff@google.com> - 8f11724067248acc330b4d1f12f0c76d03f2cfb1 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - b1dd425423380126f6441ce4fbb6f8f6c75b793a Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 361cb8a9db2f2130442389fd80593255be26d681 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 0238ab0a831f179518c1a814f9584e99da2d75a3 Merge pull request #321 from christoph-cullmann/c4245_fix... by Xiaoyi Zhang <zhangxy988@gmail.com> - 61c9bf3e3e1c28a4aa6d7f1be4b37fd473bb5529 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - bc9101f9982391019521161a36179b52555ed212 Merge pull request #320 from christoph-cullmann/master by Xiaoyi Zhang <zhangxy988@gmail.com> - 2f76a9bf50046e396138cc8eeb3cdc17b7a5ac24 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 4adaf5490921f13028b55018c9f550277de5aebb Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 27c30ec671cb7b5ba84c4e79feff7fd0b0ac6338 Avoid undefined behavior when nullptr is passed to memcpy... by Roman Gershman <romange@gmail.com> - ce65f5ac3cbf897bb5e3de1a51d80fd00866abaa Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - a18fc7461e7409c2ad64e28537261db1e02e76fa Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 8a394b19c149cab50534b04c5e21d42bc2217a7d Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - daf381e8535a1f1f1b8a75966a74e7cca63dee89 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - fa00c321073c7ea40a4fc3dfc8a06309eae3d025 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 436ba6c4a0ea3a06eca6e055f9c8d296bf3bae12 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 0cbdc774b97f7e80ab60dbe2ed4eaca3b2e33fc8 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 27c2f6e2f3b5929fbd322b0f0ca392eb02efd9f8 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - aa468ad75539619b47979911297efbb629c52e44 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - cd86d0d20ab167c33b23d3875db68d1d4bad3a3b Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 33841c5c963aa9c3f096ef8e6c1e71624b941940 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - ca3f87560a0eef716195cadf66dc6b938a579ec6 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - d902eb869bcfacc1bad14933ed9af4bed006d481 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - a02f62f456f2c4a7ecf2be3104fe0c6e16fbad9a Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 0b545b460141b882b244a1efcef7621d59278160 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - dbae8764fbd429bf7d7745e24bcf73962177a7c0 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 044da8a29c923506af0f0b46bc46f43c1e1300b5 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 6cc6ac44e065b9e8975fadfd6ccb99cbcf89aac4 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 666fc1266bccfd8e6eaaa084e7b42580bb8eb199 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 93dfcf74cb5fccae3da07897d8613ae6cab958a0 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 2c8421e1c6cef0da9e8a20b01c15256ec9ec116d Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 5b65c4af5107176555b23a638e5947686410ac1f Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - eab2078b53c9e3d9d240135c09d27e3393acb50a Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 253eb7416421661873afbaa33828a850db978541 [CMake] Set correct flags for clang-cl (#278) by Loo Rong Jie <loorongjie@gmail.com> - e75672f6afc7e8f23ee7b532e86d1b3b9be3984e Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - bf29470384a101b307873b26d358433138c857fc Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 6fd827124facd8336981e73218997f9e73029b4f Merge pull request #280 from chiumichael/master by Derek Mauro <761129+derekmauro@users.noreply.github.com> - 7c7754fb3ed9ffb57d35fe8658f3ba4d73a31e72 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 256be563447a315f2a7993ec669460ba475fa86a Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 88a152ae747c3c42dc9167d46c590929b048d436 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - c1cecb25a94c075725e9d2640f6b978a8f61957b Implement Span::first and Span::last from C++20 (#274) by Girts <girtsf@users.noreply.github.com> - 38b704384cd2f17590b3922b97744be0b43622c9 Changed HTTP URLs to HTTPS where possible (#270) by nik7273 <nik8470@gmail.com> - febc5ee6a92d0eb7dac1fceaa6c648cf6521b4dc Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 9fdf5e5b805412cb2a2e624d3e9a11588120465f Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 419f3184f8ebcdb23105295eadd2a569f3351eb9 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - b312c3cb53a0aad75a85ac2bf57c4a614fbd48d4 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 308ce31528a7edfa39f5f6d36142278a0ae1bf45 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 93d155bc4414f6c121bb1f19dba9fdb27c8943bc Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 426eaa4aa44e4580418bee46c1bd13911151bfb1 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 2901ec32a919311384d6ad4194e2d927c06831f7 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - d78310fe5a82f2e0e6e16509ef8079c8d7e4674e Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - a4cb1c8ba61531a63f9d309eea01ac1d43d8371d Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 540e2537b92cd4abfae6ceddfe24304345461f32 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 89ea0c5ff34aaa5855cfc7aa41f323b8a0ef0ede Merge pull request #255 from uilianries/hotfix/conan by ahedberg <ahedberg@google.com> - 5e0dcf72c64fae912184d2e0de87195fe8f0a425 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 0dffca4e36791c7beeda04da10460b534283948a Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 6b4201f9ef650637510a21b8d6cbcc3bee4a606f Fix GCC8 warnings by Boris Staletic <boris.staletic@gmail.com> - 0b1e6d417b414aad9282e32e8c49c719edeb63c1 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - efccc502606bed768e50a6cd5806d8eb13e4e935 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 5e6a78131f7bd5940218462c07d88cdefdd75dbe Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 5eea0f713c14ac17788b83e496f11903f8e2bbb0 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 66f9becbb98ecc083f4db349b4b1e0ca9de93b15 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 018b4db1d73ec8238e6dc4b17fd9e1fd7468d0ed Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 9449ae94397f2fd683851348e25ed8c93f75b3b9 Merge pull request #243 from ThomsonTan/FixIntrinsic by Alex Strelnikov <strel@google.com> - b16aeb6756bdab08cdf12d40baab5b51f7d15b16 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 7ffbe09f3d85504bd018783bbe1e2c12992fe47c Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 01b471d9f3ebef27f5aaca14b66509099fa8cd6c Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 7bd8f36c741c7cbe311611d7981bf38ba04c6fef Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 968a34ffdaadd7db062a9621dfbdf8b2d16e05af Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 3e2e9b5557e76d098de4b8a2a659125b98ca519b Merge pull request #231 from uilianries/feature/conan by Mark Barolak <mbxx@users.noreply.github.com> - 111ca7060a6ff50115ca85b59f6b5d8c8c5e9105 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 389ec3f906f018661a5308458d623d01f96d7b23 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 8fbcdb90952c57828c4a9c2f6d79fcd7cae9088f Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 455dc17ba1af9635f0b60155bc565bc572a1e722 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - f197d7c72a54064cfde5a2058f1513a4a0ee36fb Export of internal Abseil changes. by Abseil Team <absl-team@google.com> - 284378a71b32dfb3af4e3661f585e671d1b603a3 Export of internal Abseil changes. by Abseil Team <absl-team@google.com> GitOrigin-RevId: 9ee91d3e430fb33a4590486573792eb0fa146c2d Change-Id: Ia06e548bc106cc9d136f6c65714be6645317aced
Diffstat (limited to 'absl/random/internal/uniform_helper.h')
-rw-r--r--absl/random/internal/uniform_helper.h152
1 files changed, 152 insertions, 0 deletions
diff --git a/absl/random/internal/uniform_helper.h b/absl/random/internal/uniform_helper.h
new file mode 100644
index 00000000..6af053ef
--- /dev/null
+++ b/absl/random/internal/uniform_helper.h
@@ -0,0 +1,152 @@
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_
+#define ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_
+
+#include <cmath>
+#include <limits>
+#include <type_traits>
+
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+inline namespace lts_2019_08_08 {
+template <typename IntType>
+class uniform_int_distribution;
+
+template <typename RealType>
+class uniform_real_distribution;
+
+// Interval tag types which specify whether the interval is open or closed
+// on either boundary.
+namespace random_internal {
+struct IntervalClosedClosedT {};
+struct IntervalClosedOpenT {};
+struct IntervalOpenClosedT {};
+struct IntervalOpenOpenT {};
+} // namespace random_internal
+
+namespace random_internal {
+
+// The functions
+// uniform_lower_bound(tag, a, b)
+// and
+// uniform_upper_bound(tag, a, b)
+// are used as implementation-details for absl::Uniform().
+//
+// Conceptually,
+// [a, b] == [uniform_lower_bound(IntervalClosedClosed, a, b),
+// uniform_upper_bound(IntervalClosedClosed, a, b)]
+// (a, b) == [uniform_lower_bound(IntervalOpenOpen, a, b),
+// uniform_upper_bound(IntervalOpenOpen, a, b)]
+// [a, b) == [uniform_lower_bound(IntervalClosedOpen, a, b),
+// uniform_upper_bound(IntervalClosedOpen, a, b)]
+// (a, b] == [uniform_lower_bound(IntervalOpenClosed, a, b),
+// uniform_upper_bound(IntervalOpenClosed, a, b)]
+//
+template <typename IntType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_integral<IntType>,
+ absl::disjunction<std::is_same<Tag, IntervalOpenClosedT>,
+ std::is_same<Tag, IntervalOpenOpenT>>>::value,
+ IntType>
+uniform_lower_bound(Tag, IntType a, IntType) {
+ return a + 1;
+}
+
+template <typename FloatType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_floating_point<FloatType>,
+ absl::disjunction<std::is_same<Tag, IntervalOpenClosedT>,
+ std::is_same<Tag, IntervalOpenOpenT>>>::value,
+ FloatType>
+uniform_lower_bound(Tag, FloatType a, FloatType b) {
+ return std::nextafter(a, b);
+}
+
+template <typename NumType, typename Tag>
+typename absl::enable_if_t<
+ absl::disjunction<std::is_same<Tag, IntervalClosedClosedT>,
+ std::is_same<Tag, IntervalClosedOpenT>>::value,
+ NumType>
+uniform_lower_bound(Tag, NumType a, NumType) {
+ return a;
+}
+
+template <typename IntType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_integral<IntType>,
+ absl::disjunction<std::is_same<Tag, IntervalClosedOpenT>,
+ std::is_same<Tag, IntervalOpenOpenT>>>::value,
+ IntType>
+uniform_upper_bound(Tag, IntType, IntType b) {
+ return b - 1;
+}
+
+template <typename FloatType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_floating_point<FloatType>,
+ absl::disjunction<std::is_same<Tag, IntervalClosedOpenT>,
+ std::is_same<Tag, IntervalOpenOpenT>>>::value,
+ FloatType>
+uniform_upper_bound(Tag, FloatType, FloatType b) {
+ return b;
+}
+
+template <typename IntType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_integral<IntType>,
+ absl::disjunction<std::is_same<Tag, IntervalClosedClosedT>,
+ std::is_same<Tag, IntervalOpenClosedT>>>::value,
+ IntType>
+uniform_upper_bound(Tag, IntType, IntType b) {
+ return b;
+}
+
+template <typename FloatType, typename Tag>
+typename absl::enable_if_t<
+ absl::conjunction<
+ std::is_floating_point<FloatType>,
+ absl::disjunction<std::is_same<Tag, IntervalClosedClosedT>,
+ std::is_same<Tag, IntervalOpenClosedT>>>::value,
+ FloatType>
+uniform_upper_bound(Tag, FloatType, FloatType b) {
+ return std::nextafter(b, (std::numeric_limits<FloatType>::max)());
+}
+
+template <typename NumType>
+using UniformDistribution =
+ typename std::conditional<std::is_integral<NumType>::value,
+ absl::uniform_int_distribution<NumType>,
+ absl::uniform_real_distribution<NumType>>::type;
+
+template <typename TagType, typename NumType>
+struct UniformDistributionWrapper : public UniformDistribution<NumType> {
+ explicit UniformDistributionWrapper(NumType lo, NumType hi)
+ : UniformDistribution<NumType>(
+ uniform_lower_bound<NumType>(TagType{}, lo, hi),
+ uniform_upper_bound<NumType>(TagType{}, lo, hi)) {}
+};
+
+} // namespace random_internal
+} // inline namespace lts_2019_08_08
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_UNIFORM_HELPER_H_