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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup bli
*/
#include "BLI_cpp_type.hh"
#include "BLI_span.hh"
namespace blender {
/**
* A generic span. It behaves just like a blender::Span<T>, but the type is only known at run-time.
*/
class GSpan {
protected:
const CPPType *type_ = nullptr;
const void *data_ = nullptr;
int64_t size_ = 0;
public:
GSpan() = default;
GSpan(const CPPType *type, const void *buffer, int64_t size)
: type_(type), data_(buffer), size_(size)
{
BLI_assert(size >= 0);
BLI_assert(buffer != nullptr || size == 0);
BLI_assert(size == 0 || type != nullptr);
BLI_assert(type == nullptr || type->pointer_has_valid_alignment(buffer));
}
GSpan(const CPPType &type, const void *buffer, int64_t size) : GSpan(&type, buffer, size)
{
}
GSpan(const CPPType &type) : type_(&type)
{
}
GSpan(const CPPType *type) : type_(type)
{
}
template<typename T>
GSpan(Span<T> array)
: GSpan(CPPType::get<T>(), static_cast<const void *>(array.data()), array.size())
{
}
const CPPType &type() const
{
BLI_assert(type_ != nullptr);
return *type_;
}
const CPPType *type_ptr() const
{
return type_;
}
bool is_empty() const
{
return size_ == 0;
}
int64_t size() const
{
return size_;
}
const void *data() const
{
return data_;
}
const void *operator[](int64_t index) const
{
BLI_assert(index < size_);
return POINTER_OFFSET(data_, type_->size() * index);
}
template<typename T> Span<T> typed() const
{
BLI_assert(type_->is<T>());
return Span<T>(static_cast<const T *>(data_), size_);
}
GSpan slice(const int64_t start, int64_t size) const
{
BLI_assert(start >= 0);
BLI_assert(size >= 0);
const int64_t new_size = std::max<int64_t>(0, std::min(size, size_ - start));
return GSpan(type_, POINTER_OFFSET(data_, type_->size() * start), new_size);
}
GSpan slice(const IndexRange range) const
{
return this->slice(range.start(), range.size());
}
GSpan drop_front(const int64_t n) const
{
BLI_assert(n >= 0);
const int64_t new_size = std::max<int64_t>(0, size_ - n);
return GSpan(*type_, POINTER_OFFSET(data_, type_->size() * n), new_size);
}
GSpan drop_back(const int64_t n) const
{
BLI_assert(n >= 0);
const int64_t new_size = std::max<int64_t>(0, size_ - n);
return GSpan(*type_, data_, new_size);
}
GSpan take_front(const int64_t n) const
{
BLI_assert(n >= 0);
const int64_t new_size = std::min<int64_t>(size_, n);
return GSpan(*type_, data_, new_size);
}
GSpan take_back(const int64_t n) const
{
BLI_assert(n >= 0);
const int64_t new_size = std::min<int64_t>(size_, n);
return GSpan(*type_, POINTER_OFFSET(data_, type_->size() * (size_ - new_size)), new_size);
}
};
/**
* A generic mutable span. It behaves just like a blender::MutableSpan<T>, but the type is only
* known at run-time.
*/
class GMutableSpan {
protected:
const CPPType *type_ = nullptr;
void *data_ = nullptr;
int64_t size_ = 0;
public:
GMutableSpan() = default;
GMutableSpan(const CPPType *type, void *buffer, int64_t size)
: type_(type), data_(buffer), size_(size)
{
BLI_assert(size >= 0);
BLI_assert(buffer != nullptr || size == 0);
BLI_assert(size == 0 || type != nullptr);
BLI_assert(type == nullptr || type->pointer_has_valid_alignment(buffer));
}
GMutableSpan(const CPPType &type, void *buffer, int64_t size) : GMutableSpan(&type, buffer, size)
{
}
GMutableSpan(const CPPType &type) : type_(&type)
{
}
GMutableSpan(const CPPType *type) : type_(type)
{
}
template<typename T>
GMutableSpan(MutableSpan<T> array)
: GMutableSpan(CPPType::get<T>(), static_cast<void *>(array.begin()), array.size())
{
}
operator GSpan() const
{
return GSpan(type_, data_, size_);
}
const CPPType &type() const
{
BLI_assert(type_ != nullptr);
return *type_;
}
const CPPType *type_ptr() const
{
return type_;
}
bool is_empty() const
{
return size_ == 0;
}
int64_t size() const
{
return size_;
}
void *data() const
{
return data_;
}
void *operator[](int64_t index) const
{
BLI_assert(index >= 0);
BLI_assert(index < size_);
return POINTER_OFFSET(data_, type_->size() * index);
}
template<typename T> MutableSpan<T> typed() const
{
BLI_assert(type_->is<T>());
return MutableSpan<T>(static_cast<T *>(data_), size_);
}
GMutableSpan slice(const int64_t start, int64_t size) const
{
BLI_assert(start >= 0);
BLI_assert(size >= 0);
const int64_t new_size = std::max<int64_t>(0, std::min(size, size_ - start));
return GMutableSpan(*type_, POINTER_OFFSET(data_, type_->size() * start), new_size);
}
GMutableSpan slice(IndexRange range) const
{
return this->slice(range.start(), range.size());
}
GMutableSpan drop_front(const int64_t n) const
{
BLI_assert(n >= 0);
const int64_t new_size = std::max<int64_t>(0, size_ - n);
return GMutableSpan(*type_, POINTER_OFFSET(data_, type_->size() * n), new_size);
}
GMutableSpan drop_back(const int64_t n) const
{
BLI_assert(n >= 0);
const int64_t new_size = std::max<int64_t>(0, size_ - n);
return GMutableSpan(*type_, data_, new_size);
}
GMutableSpan take_front(const int64_t n) const
{
BLI_assert(n >= 0);
const int64_t new_size = std::min<int64_t>(size_, n);
return GMutableSpan(*type_, data_, new_size);
}
GMutableSpan take_back(const int64_t n) const
{
BLI_assert(n >= 0);
const int64_t new_size = std::min<int64_t>(size_, n);
return GMutableSpan(
*type_, POINTER_OFFSET(data_, type_->size() * (size_ - new_size)), new_size);
}
/**
* Copy all values from another span into this span. This invokes undefined behavior when the
* destination contains uninitialized data and T is not trivially copy constructible.
* The size of both spans is expected to be the same.
*/
void copy_from(GSpan values)
{
BLI_assert(type_ == &values.type());
BLI_assert(size_ == values.size());
type_->copy_assign_n(values.data(), data_, size_);
}
};
} // namespace blender
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