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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "util/ConstBuffer.hxx"
#include <gtest/gtest.h>
#include <array>
#include <random>
#include <stddef.h>
#include <stdint.h>
template<typename T>
struct RandomInt {
typedef std::minstd_rand Engine;
Engine engine;
static_assert(sizeof(T) <= sizeof(Engine::result_type),
"RNG result type too small");
T operator()() {
return T(engine());
}
};
struct RandomInt24 : RandomInt<int32_t> {
int32_t operator()() {
auto t = RandomInt::operator()();
t &= 0xffffff;
if (t & 0x800000)
t |= 0xff000000;
return t;
}
};
struct RandomFloat {
std::mt19937 gen;
std::uniform_real_distribution<float> dis;
RandomFloat():gen(std::random_device()()), dis(-1.0, 1.0) {}
float operator()() {
return dis(gen);
}
};
template<typename T, size_t N>
class TestDataBuffer : std::array<T, N> {
public:
using typename std::array<T, N>::const_pointer;
using std::array<T, N>::size;
using std::array<T, N>::begin;
using std::array<T, N>::end;
using std::array<T, N>::operator[];
template<typename G=RandomInt<T>>
TestDataBuffer(G g=G()):std::array<T, N>() {
for (auto &i : *this)
i = g();
}
operator typename std::array<T, N>::const_pointer() const {
return begin();
}
operator ConstBuffer<T>() const {
return { begin(), size() };
}
operator ConstBuffer<void>() const {
return { begin(), size() * sizeof(T) };
}
};
template<typename T>
bool
AssertEqualWithTolerance(const T &a, const T &b, unsigned tolerance)
{
EXPECT_EQ(a.size(), b.size());
for (unsigned i = 0; i < a.size(); ++i) {
int64_t x = a[i], y = b[i];
EXPECT_GE(x, y - int64_t(tolerance));
EXPECT_LE(x, y + int64_t(tolerance));
}
return true;
}
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