C / C++ / MFC

jon_80 wrote:

I meant to declare that the function can throw the exception, doesn't this syntax indicate that this is what the function does?

jon_80 wrote:

I tried it anyway just in case and it doesn't compile.

DavidCrow wrote:

I've not ever seen throw() used in a class definition like that.

Zac Howland wrote:

...but it is hidden behind a #define macro.

Zac Howland wrote:

However, I do remember CFile having a constructor that throws an exception. If you look at the header file for it, you should see something at the end of the defintion that looks like _THROW() (which is #define'd as throw(...)).

// Constructors
CFile();
CFile(int hFile);
CFile(LPCTSTR lpszFileName, UINT nOpenFlags);

DavidCrow wrote:

CFile(LPCTSTR lpszFileName, UINT nOpenFlags);

Zac Howland wrote:

That is the one that throws the exception.

Zac Howland wrote:

I thought it had the macro beside it, but it might be on the Open method.

DavidCrow wrote:

True, but I see no way of knowing this without looking at the constructor's implementation.

DavidCrow wrote:

Neither one. I don't find "throw" in any class definition.

C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xstddef(26): #define _THROW0()	throw ()
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xstddef(27): #define _THROW1(x)	throw (...)
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xstddef(28): #define _THROW(x, y)	throw x(y)
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xstddef(39): #define _THROW0()
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xstddef(40): #define _THROW1(x)
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xstddef(41): #define _THROW(x, y)	x(y)._Raise()
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xtree(592):			_THROW(out_of_range, "invalid map/set<T> iterator");
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xtree(913):			_THROW(length_error, "map/set<T> too long");
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xutility(866):	istreambuf_iterator(streambuf_type *_Sb = 0) _THROW0()
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xutility(871):	istreambuf_iterator(istream_type& _Istr) _THROW0()
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xutility(969):	ostreambuf_iterator(streambuf_type *_Sb) _THROW0()
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xutility(974):	ostreambuf_iterator(ostream_type& _Ostr) _THROW0()
C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xutility(1003):	bool failed() const _THROW0()

jon_80 wrote:

bool readFile(char strFileToRead[MAX_SENTENCE_LENGTH + 1]) throw (CSentenceAr);

Zac Howland wrote:

Unless you have to define your own exception class for an assignment, you should use the standard exception class, or use MFC's CException class.

jon_80 wrote:

To be honest I wish I could use MFC

jon_80 wrote:

 <code>      {    //Error: file cannot be read
            throw (CSentenceAr);
// #2 (see below)
            return false;
        }</code>

jon_80 wrote:

char* passwordEntry(int allowedSize)
{
const int size = 100;
if (allowedSize > size)
{
cout << "Password size is too large. Size limit is " << size << endl;
allowedSize = size;
}

char password[size];
cout << "Enter your password:";
cin.getline(password,size);
if (strlen(password)>allowedSize)
{throw password;}

return password;
}

#include <iostream>
#include <string>
#include <exception>

using namespace std;

string passwordEntry(int allowedSize)
{
	const int SIZE = 100;
	if (allowedSize > SIZE)
	{
		cout << "Password size is too large. Size limit is " << SIZE << endl;
		allowedSize = SIZE;
	}

	string password = "";
	char buffer[SIZE] = {0};
	cout << "Enter your password:";
	cin.getline(buffer, size);
	password = buffer;
    
	if (password.length() > allowedSize)
	{
		throw exception("Invalid password size!");
	}

	return password;
}
void main ()
{
	const int LEGAL_PASSWD_SIZE = 8;
	string password = "";

	try
	{
		password = passwordEntry(LEGAL_PASSWD_SIZE);
	}
	catch (const exception& e)
	{
		cout << e.what() << endl;
		password = "*********";
	}

	cout << "Password is stored as " << password.c_str() << endl;
}