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Diffstat (limited to 'src/TinyVector.h')
-rw-r--r-- | src/TinyVector.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/TinyVector.h b/src/TinyVector.h new file mode 100644 index 0000000..63e7caf --- /dev/null +++ b/src/TinyVector.h @@ -0,0 +1,131 @@ +/* + Copyright 2016-2023 melonDS team, RSDuck + + This file is part of melonDS. + + melonDS 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 3 of the License, or (at your option) + any later version. + + melonDS 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 melonDS. If not, see http://www.gnu.org/licenses/. +*/ + +#ifndef MELONDS_TINYVECTOR_H +#define MELONDS_TINYVECTOR_H + +#include <assert.h> +#include <string.h> +#include "types.h" + +namespace ARMJIT +{ +/* + TinyVector + - because reinventing the wheel is the best! + + - meant to be used very often, with not so many elements + max 1 << 16 elements + - doesn't allocate while no elements are inserted + - not stl confirmant of course + - probably only works with POD types + - remove operations don't preserve order, but O(1)! +*/ +template<typename T> +struct __attribute__((packed)) TinyVector +{ + T* Data = NULL; + u16 Capacity = 0; + u16 Length = 0; + + ~TinyVector() + { + delete[] Data; + } + + void MakeCapacity(u32 capacity) + { + assert(capacity <= UINT16_MAX); + assert(capacity > Capacity); + T* newMem = new T[capacity]; + if (Data != NULL) + memcpy(newMem, Data, sizeof(T) * Length); + + T* oldData = Data; + Data = newMem; + if (oldData != NULL) + delete[] oldData; + + Capacity = capacity; + } + + void SetLength(u16 length) + { + if (Capacity < length) + MakeCapacity(length); + + Length = length; + } + + void Clear() + { + Length = 0; + } + + void Add(T element) + { + assert(Length + 1 <= UINT16_MAX); + if (Length + 1 > Capacity) + MakeCapacity(((Capacity + 4) * 3) / 2); + + Data[Length++] = element; + } + + void Remove(int index) + { + assert(Length > 0); + assert(index >= 0 && index < Length); + + Length--; + Data[index] = Data[Length]; + /*for (int i = index; i < Length; i++) + Data[i] = Data[i + 1];*/ + } + + int Find(T needle) + { + for (int i = 0; i < Length; i++) + { + if (Data[i] == needle) + return i; + } + return -1; + } + + bool RemoveByValue(T needle) + { + for (int i = 0; i < Length; i++) + { + if (Data[i] == needle) + { + Remove(i); + return true; + } + } + return false; + } + + T& operator[](int index) + { + assert(index >= 0 && index < Length); + return Data[index]; + } +}; +} + +#endif //MELONDS_TINYVECTOR_H |