handle.hpp

// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "winapi-common" project.
// For details, see https://github.com/egor-tensin/winapi-common.
// Distributed under the MIT License.
 
#pragma once
 
#include "buffer.hpp"
 
#include <windows.h>
 
#include <cstddef>
#include <memory>
#include <string>
#include <utility>
 
namespace winapi {
 
class Handle {
public:
    Handle() = default;
    explicit Handle(HANDLE);
 
    HANDLE get() const { return m_impl.get(); }
    HANDLE ptr() const { return get(); }
 
    explicit operator HANDLE() const { return ptr(); }
 
    bool is_valid() const;
    static bool is_valid(HANDLE);
 
    void close();
 
    bool is_std() const;
    static Handle std_in();
    static Handle std_out();
    static Handle std_err();
 
    Buffer read() const;
 
    static constexpr std::size_t max_chunk_size = 16 * 1024;
    bool read_chunk(Buffer& read_chunk) const;
 
    void write(const void* data, std::size_t nb) const;
    void write(const Buffer& buffer) const;
 
    template <typename CharT>
    void write(const std::basic_string<CharT>& src) const {
        write(src.c_str(), src.size() * sizeof(CharT));
    }
 
    void inherit(bool yes = true) const;
    void dont_inherit() const { inherit(false); }
 
private:
    struct Close {
        void operator()(HANDLE) const;
    };
 
    std::unique_ptr<void, Close> m_impl;
};
 
} // namespace winapi