libcxx/benchmarks/Utilities.h

   1 // -*- C++ -*-
   2 //===----------------------------------------------------------------------===//
   3 //
   4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 // See https://llvm.org/LICENSE.txt for license information.
   6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #ifndef BENCHMARK_UTILITIES_H
  11 #define BENCHMARK_UTILITIES_H
  12
  13 #include <cassert>
  14 #include <type_traits>
  15
  16 #include "benchmark/benchmark.h"
  17
  18 namespace UtilitiesInternal {
  19   template <class Container>
  20   auto HaveDataImpl(int) -> decltype((std::declval<Container&>().data(), std::true_type{}));
  21   template <class Container>
  22   auto HaveDataImpl(long) -> std::false_type;
  23   template <class T>
  24   using HasData = decltype(HaveDataImpl<T>(0));
  25 } // namespace UtilitiesInternal
  26
  27 template <class Container, std::enable_if_t<UtilitiesInternal::HasData<Container>::value>* = nullptr>
  28 void DoNotOptimizeData(Container &c) { benchmark::DoNotOptimize(c.data()); }
  29 template <class Container, std::enable_if_t<!UtilitiesInternal::HasData<Container>::value>* = nullptr>
  30 void DoNotOptimizeData(Container &c) { benchmark::DoNotOptimize(&c); }
  31
  32
  33 #endif // BENCHMARK_UTILITIES_H