/usr/include/kj/vector.h is in libcapnp-dev 0.5.3-2ubuntu1.1.
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// Licensed under the MIT License:
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef KJ_VECTOR_H_
#define KJ_VECTOR_H_
#if defined(__GNUC__) && !KJ_HEADER_WARNINGS
#pragma GCC system_header
#endif
#include "array.h"
namespace kj {
template <typename T>
class Vector {
// Similar to std::vector, but based on KJ framework.
//
// This implementation always uses move constructors when growing the backing array. If the
// move constructor throws, the Vector is left in an inconsistent state. This is acceptable
// under KJ exception theory which assumes that exceptions leave things in inconsistent states.
// TODO(someday): Allow specifying a custom allocator.
public:
inline Vector() = default;
inline explicit Vector(size_t capacity): builder(heapArrayBuilder<T>(capacity)) {}
inline operator ArrayPtr<T>() { return builder; }
inline operator ArrayPtr<const T>() const { return builder; }
inline ArrayPtr<T> asPtr() { return builder.asPtr(); }
inline ArrayPtr<const T> asPtr() const { return builder.asPtr(); }
inline size_t size() const { return builder.size(); }
inline bool empty() const { return size() == 0; }
inline size_t capacity() const { return builder.capacity(); }
inline T& operator[](size_t index) const { return builder[index]; }
inline const T* begin() const { return builder.begin(); }
inline const T* end() const { return builder.end(); }
inline const T& front() const { return builder.front(); }
inline const T& back() const { return builder.back(); }
inline T* begin() { return builder.begin(); }
inline T* end() { return builder.end(); }
inline T& front() { return builder.front(); }
inline T& back() { return builder.back(); }
inline Array<T> releaseAsArray() {
// TODO(perf): Avoid a copy/move by allowing Array<T> to point to incomplete space?
if (!builder.isFull()) {
setCapacity(size());
}
return builder.finish();
}
template <typename... Params>
inline T& add(Params&&... params) {
if (builder.isFull()) grow();
return builder.add(kj::fwd<Params>(params)...);
}
template <typename Iterator>
inline void addAll(Iterator begin, Iterator end) {
size_t needed = builder.size() + (end - begin);
if (needed > builder.capacity()) grow(needed);
builder.addAll(begin, end);
}
template <typename Container>
inline void addAll(Container&& container) {
addAll(container.begin(), container.end());
}
inline void removeLast() {
builder.removeLast();
}
inline void resize(size_t size) {
if (size > builder.capacity()) grow(size);
while (builder.size() < size) {
builder.add(T());
}
while (builder.size() > size) {
builder.removeLast();
}
}
private:
ArrayBuilder<T> builder;
void grow(size_t minCapacity = 0) {
setCapacity(kj::max(minCapacity, capacity() == 0 ? 4 : capacity() * 2));
}
void setCapacity(size_t newSize) {
ArrayBuilder<T> newBuilder = heapArrayBuilder<T>(newSize);
size_t moveCount = kj::min(newSize, builder.size());
for (size_t i = 0; i < moveCount; i++) {
newBuilder.add(kj::mv(builder[i]));
}
builder = kj::mv(newBuilder);
}
};
} // namespace kj
#endif // KJ_VECTOR_H_
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