file_contents.hpp

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#ifndef EAGINE_FILE_CONTENTS_HPP
#define EAGINE_FILE_CONTENTS_HPP
 
#include "branch_predict.hpp"
#include "config/basic.hpp"
#include "interface.hpp"
#include "protected_member.hpp"
#include "string_span.hpp"
#include "struct_memory_block.hpp"
#include <memory>
 
namespace eagine {
 
struct file_contents_intf : interface<file_contents_intf> {
    virtual auto block() noexcept -> memory::const_block = 0;
};
 
class file_contents {
public:
    file_contents() = default;
 
    file_contents(string_view path);
 
    auto is_loaded() const noexcept -> bool {
        return bool(_pimpl);
    }
 
    explicit operator bool() const noexcept {
        return is_loaded();
    }
 
    auto block() const noexcept -> memory::const_block {
        return bool(EAGINE_LIKELY(_pimpl)) ? _pimpl->block()
                                           : memory::const_block();
    }
 
    operator memory::const_block() const noexcept {
        return block();
    }
 
private:
    std::shared_ptr<file_contents_intf> _pimpl{};
};
 
template <typename T>
class structured_file_content
  : protected_member<file_contents>
  , public structured_memory_block<const T> {
public:
    structured_file_content(string_view path)
      : protected_member<file_contents>(path)
      , structured_memory_block<const T>(get_the_member()) {}
 
    structured_file_content(file_contents&& fc)
      : protected_member<file_contents>(std::move(fc))
      , structured_memory_block<const T>(get_the_member()) {}
};
 
} // namespace eagine
 
#if !EAGINE_LINK_LIBRARY || defined(EAGINE_IMPLEMENTING_LIBRARY)
#include <eagine/file_contents.inl>
#endif
 
#endif // EAGINE_FILE_CONTENTS_HPP