file_istream.h

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#pragma once
 
 
 
#include "file_stream_common.h"
 
#include "filesystem.h"
 
 
 
#include <iosfwd>
 
#include <istream>
 
#include <memory>
 
 
 
namespace fs
 
{
 
 
 
 
 
class file_istream : public std::istream
 
{
 
public:
 
    file_istream();
 
    explicit file_istream(const path& file_path,
 
                          std::ios_base::openmode mode = default_file_read_mode);
 
    explicit file_istream(const std::string& absolute_path,
 
                          std::ios_base::openmode mode = default_file_read_mode);
 
    explicit file_istream(FILE* file, file_stream_ownership ownership = file_stream_ownership::take_ownership);
 
 
 
    file_istream(const file_istream&) = delete;
 
    auto operator=(const file_istream&) -> file_istream& = delete;
 
    file_istream(file_istream&& other) noexcept;
 
    auto operator=(file_istream&& other) noexcept -> file_istream&;
 
    ~file_istream() override;
 
 
 
    void open(const path& file_path, std::ios_base::openmode mode = default_file_read_mode);
 
    void open(const std::string& absolute_path, std::ios_base::openmode mode = default_file_read_mode);
 
 
 
    auto is_open() const -> bool;
 
    auto native_handle() const -> FILE*;
 
    auto tell() const -> long long;
 
    auto file_size() const -> long long;
 
    auto seek(long long offset, int whence = SEEK_SET) -> bool;
 
    void close();
 
 
 
private:
 
    struct impl;
 
    std::unique_ptr<impl> impl_;
 
};
 
 
 
} // namespace fs