#ifndef COMMON_H
#define COMMON_H

#include <memory>
#include <optional>
#include <stdexcept>
#include <windows.h>

TCHAR *TszFromSz(const char *, int);
struct Win32Error : public std::exception
{
	Win32Error(DWORD);
	~Win32Error(void);
	virtual const char *what(void) const noexcept override;
private:
	DWORD m_dwErr;
	char *m_szMsg = NULL;
};
struct Library
{
	Library(const TCHAR *);
	~Library(void);
	FARPROC GetProcAddress(const char *);
private:
	HMODULE m_hModule;
};

#ifdef UNICODE
#define WA "W"
#else
#define WA "A"
#endif

inline int Cmp(int a, int b)
{
	if (a == b)
		return 0;
	if (a > b)
		return 1;
	return -1;
}

inline int Dpi(int i)
{
	extern int g_iDPI;
	return MulDiv(i, g_iDPI, 96);
}

template <class T, typename ...A>
std::optional<T> try_make(A ...args)
{
	try {
		return T(args...);
	} catch (...) {
		return {};
	}
}

#endif