libcruft-util/extent.cpp

114 lines
2.8 KiB
C++

/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
*/
#include "extent.hpp"
#include "maths.hpp"
#include <algorithm>
#include <numeric>
using cruft::extent;
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
extent<S,T>::extent (vector<S,T> _v)
{
std::transform (std::begin (_v),
std::end (_v),
this->begin (),
[] (auto i) {
// using std::abs gives unsigned abs warnings under clang. this tricks
// it sufficiently to quiet the warnings.
return i < 0 ? -i : i;
});
}
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
extent<S,T>
extent<S,T>::expanded (cruft::vector<S,T> mag) const
{
return *this + mag;
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::expanded (T t) const
{
return *this + cruft::vector<S,T> {t};
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::contracted (vector<S,T> t) const
{
return *this - t;
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
extent<S,T>
extent<S,T>::contracted (T t) const
{
return *this - vector<S,T> {t};
}
///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
bool
extent<S,T>::empty (void) const
{
return almost_zero (area());
}
///////////////////////////////////////////////////////////////////////////////
namespace cruft::debug {
template <size_t S, typename T>
struct validator<extent<S,T>> {
static bool is_valid (const extent<S,T> &e)
{
return std::all_of (std::begin (e.data),
std::end (e.data),
[] (auto i) { return i >= 0; });
}
};
}
//-----------------------------------------------------------------------------
#define INSTANTIATE_S_T(S,T) \
template struct ::cruft::extent<(S),T>; \
template bool ::cruft::debug::is_valid (const ::cruft::extent<(S),T>&); \
template struct ::cruft::debug::validator<::cruft::extent<(S),T>>;
#define INSTANTIATE(T) \
INSTANTIATE_S_T(1,T) \
INSTANTIATE_S_T(2,T) \
INSTANTIATE_S_T(3,T)
INSTANTIATE( int16_t)
INSTANTIATE( int32_t)
INSTANTIATE( int64_t)
INSTANTIATE(uint16_t)
INSTANTIATE(uint32_t)
INSTANTIATE(uint64_t)
INSTANTIATE(float)
INSTANTIATE(double)