StdCopyStrBuf GetRegistryString(const char *szSubKey, const char *szValueName)
{
HKEY ckey;
// Open the key
if (RegOpenKeyExW(HKEY_CURRENT_USER, GetWideChar(szSubKey), 0, KEY_READ, &ckey)!=ERROR_SUCCESS)
return StdCopyStrBuf();
// Get the value
DWORD dwValSize = 128;
BYTE *sValue = new BYTE[dwValSize];
while(true)
{
DWORD valtype;
switch(RegQueryValueExW(ckey, GetWideChar(szValueName), NULL, &valtype,
sValue, &dwValSize))
{
case ERROR_SUCCESS:
RegCloseKey(ckey);
if (valtype == REG_SZ)
{
StdCopyStrBuf nrv(reinterpret_cast<wchar_t*>(sValue));
delete[] sValue;
return nrv;
} else {
default:
delete[] sValue;
return StdCopyStrBuf();
}
break;
case ERROR_MORE_DATA:
delete[] sValue;
sValue = new BYTE[dwValSize];
break;
}
}
}
friend T operator|( const T& lhs, const T& rhs )
noexcept( noexcept( T( lhs ), std::declval< T& >() |= rhs, T( std::declval< T& >() ) ) )
{
T nrv( lhs );
nrv |= rhs;
return nrv;
}
friend T operator|( U&& lhs, const T& rhs )
noexcept( noexcept( T( rhs ), std::declval< T& >() |= std::move( lhs ), T( std::declval< T& >() ) ) )
{
T nrv( rhs );
nrv |= std::move( lhs );
return nrv;
}
friend T operator&( U&& lhs, T&& rhs )
noexcept( noexcept( T( std::move( lhs ) ), std::declval< T& >() &= std::move( rhs ), T( std::declval< T& >() ) ) )
{
T nrv( std::move( lhs ) );
nrv &= std::move( rhs );
return nrv;
}
friend T operator--(T& x, int)
{
decrementable_type nrv(x);
--x;
return nrv;
}
friend T operator++(T& x, int)
{
incrementable_type nrv(x);
++x;
return nrv;
}