darling-libcxx/benchmarks/Utilities.h
Nico Weber 630780b320 libcxx: Rename .hpp files in libcxx/benchmarks to .h
LLVM uses .h as its extension for header files.

Differential Revision: https://reviews.llvm.org/D66509

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@369487 91177308-0d34-0410-b5e6-96231b3b80d8
2019-08-21 01:59:12 +00:00

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef BENCHMARK_UTILITIES_H
#define BENCHMARK_UTILITIES_H
#include <cassert>
#include <type_traits>
#include "benchmark/benchmark.h"
namespace UtilitiesInternal {
template <class Container>
auto HaveDataImpl(int) -> decltype((std::declval<Container&>().data(), std::true_type{}));
template <class Container>
auto HaveDataImpl(long) -> std::false_type;
template <class T>
using HasData = decltype(HaveDataImpl<T>(0));
} // namespace UtilitiesInternal
template <class Container, std::enable_if_t<UtilitiesInternal::HasData<Container>::value>* = nullptr>
void DoNotOptimizeData(Container &c) { benchmark::DoNotOptimize(c.data()); }
template <class Container, std::enable_if_t<!UtilitiesInternal::HasData<Container>::value>* = nullptr>
void DoNotOptimizeData(Container &c) { benchmark::DoNotOptimize(&c); }
#endif // BENCHMARK_UTILITIES_H