60 lines
1.1 KiB
C++
60 lines
1.1 KiB
C++
#include "vec.h"
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#include <cstddef>
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#include <cstring>
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#include <iostream>
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Vec::Vec() : cap(INITIAL_LEN), w_idx(0), arr(nullptr) {
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std::cout << "Allocating vector" << std::endl;
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arr = new T[INITIAL_LEN];
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}
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Vec::Vec(std::initializer_list<T> il) : Vec() {
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for (auto &a : il) push_back(a);
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}
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Vec::~Vec() {
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std::cout << "De-allocating vector" << std::endl;
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if (arr)
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delete[] arr;
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}
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T &Vec::operator[](std::size_t idx) const noexcept {
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if (idx < w_idx)
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return arr[idx];
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exit(1);
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}
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void Vec::push_back(const T &value) noexcept {
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arr[w_idx++] = value;
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if (w_idx == cap) {
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resize(cap * 2);
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}
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}
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std::size_t Vec::size() const { return w_idx; }
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std::size_t Vec::capacity() const noexcept { return cap; }
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void Vec::resize(std::size_t newsize) {
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std::cout << "Reallocating" << std::endl;
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T *newarr = new T[newsize];
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std::memcpy(newarr, arr, w_idx);
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delete[] arr;
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arr = newarr;
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cap = newsize;
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}
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void Vec::pop_back() noexcept { --w_idx; }
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void Vec::clear() noexcept {
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#ifdef REALCLEAR
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delete[] arr;
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arr = new T[INITIAL_LEN];
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cap = INITIAL_LEN;
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#endif
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w_idx = 0;
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}
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