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82 lines
2.2 KiB
82 lines
2.2 KiB
#pragma once
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#include <cstdint>
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#include <memory>
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#include <utility>
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#include <vector>
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#include <panic.h>
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struct file_back_buffer
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{
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const static constexpr std::size_t DEFAULT_CAP = 1024;
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typedef std::uint8_t byte;
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file_back_buffer();
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file_back_buffer(std::size_t cap);
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file_back_buffer(const file_back_buffer& c) = delete;
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inline file_back_buffer(file_back_buffer&& m) : inner(std::move(m.inner)){}
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void push_buf(byte* buf, std::size_t len);
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bool back(byte* buf, std::size_t len) const;
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bool pop_n(std::size_t len);
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~file_back_buffer();
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private:
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struct impl;
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std::unique_ptr<impl> inner;
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};
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namespace {
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template<typename T>
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inline const T* _die_if_null(const T* input, const char* msg)
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{
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if(!input) panic(msg);
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return input;
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}
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template<typename T>
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inline T* _die_if_null(T* input, const char* msg)
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{
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if(!input) panic(msg);
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return input;
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}
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}
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template<typename T>
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struct file_vector
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{
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inline file_vector() : file_vector(file_back_buffer::DEFAULT_CAP){}
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inline file_vector(std::size_t cap) : inserter(file_back_buffer(cap)), len(0), current_back(std::vector(sizeof(T))) {current_back.resize(sizeof(T));}
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inline file_vector(const file_vector<T>& c) = delete;
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inline file_vector(file_vector<T>&& m) : inserter(std::move(m.inserter)), len(m.len), current_back(std::move(m.current_back)){}
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inline void push_back(T&& value)
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{
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inserter.push_buf((file_back_buffer::byte*)&value, sizeof(T));
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len += 1;
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}
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inline T& back()
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{
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if(!len) panic("back() called on empty file_vector");
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if(!inserter.back(¤t_back[0], sizeof(T))) panic("back() failed");
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return *_die_if_null((T*)¤t_back[0], "file_vector::back() returned null pointer");
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}
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inline const T& back() const
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{
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if(!len) panic("back() called on empty file_vector");
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if(!inserter.back(¤t_back[0], sizeof(T))) panic("back() failed");
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return *_die_if_null((const T*)¤t_back[0], "file_vector::back() (const) returned null pointer");
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}
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inline void pop_back()
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{
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if(!len) return;
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if(!inserter.pop_n(sizeof(T))) panic("pop_back(): 0 elements");
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len-=1;
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}
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private:
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mutable std::vector<unsigned char> current_back; // what an awful hack...
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file_back_buffer inserter;
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std::uint64_t len;
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};
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