platform.h

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#pragma once
 
#include <cstdint>
#include <expected>
#include <filesystem>
#include <string>
 
namespace mm::core {
 
std::filesystem::path exeDir();
 
std::filesystem::path userCacheDir();
 
std::string errnoMessage(int err);
 
void openInBrowser(const std::string& url);
 
class SingleInstanceLock {
 public:
  SingleInstanceLock() = default;
  SingleInstanceLock(SingleInstanceLock&& other) noexcept;
  SingleInstanceLock& operator=(SingleInstanceLock&& other) noexcept;
  SingleInstanceLock(const SingleInstanceLock&) = delete;
  SingleInstanceLock& operator=(const SingleInstanceLock&) = delete;
  ~SingleInstanceLock();
 
 private:
  explicit SingleInstanceLock(std::intptr_t handle) : handle_(handle) {}
  friend std::expected<SingleInstanceLock, std::string> acquireSingleInstanceLock();
 
  static constexpr std::intptr_t kInvalid = -1;  
  std::intptr_t handle_ = kInvalid;              
};
 
std::expected<SingleInstanceLock, std::string> acquireSingleInstanceLock();
 
}  // namespace mm::core