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#ifndef COMMON_H
#define COMMON_H
#include <memory>
#include <optional>
#include <windows.h>
#ifdef UNICODE
#define WA "W"
#else
#define WA "A"
#endif
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;
};
inline int Cmp(int a, int b)
{
if (a == b) return 0;
if (a > b) return 1;
return -1;
}
/* Return integer scaled for current DPI. */
inline int Dpi(int i)
{
extern int g_iDPI;
return MulDiv(i, g_iDPI, 96);
}
/* Create and return an object of type C. If construction fails,
* return nothing. The returned value must be checked before being
* used, as dereferencing is undefined if the value is empty. */
template <class C, typename ...T>
std::optional<C> try_make(T ...args)
{
try {
return C(args...);
} catch (...) {
return {};
}
}
#endif
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