C++ primes using find_if

[cenzuratu]

First of all i'm a beginner in progamming.
I need to make a calculator for aritmetics, combinatorials and number strings.
I'm stuck at the primes because i need to use some algorithm and i didnt understand them.

  TestPrim::TestPrim(Uint val) 	
		{
			_val = val;
			_stopVal = sqrt(double(_val));
		}

	TestPrim& TestPrim::operator++()
	{
		_val += 2;
		_stopVal = sqrt(double(_val));
		return *this;
	}

	bool TestPrim::operator() (Uint divizor)
	{
		if( divizor > _stopVal || 0 == _val % divizor )
		{
			return true;
		}

	}
	
	bool operator > (Uint val, const TestPrim &src)
	{
		if(val > src._stopVal)
		{
			return true;
		}
	}

	TestPrim::operator Uint ()
	{
		return _val;
	}

	

	void Prime::CalculeazaValori(int index)
	{
		
		while(_elemente.size() < _count)
		{
			if(_elemente.size() == 0 )
			{
				_elemente.push_back(2);
				_elemente.push_back(3);
			}

			
			TestPrim testPrim = _elemente.back() + 2;
			for(testPrim; Uint index< _count;++testPrim)
			{
				vector<Uint>::iterator TIterator=find_if(TVint.begin(),TVint.end(),testPrim);
				if(TIterator > testPrim )
				{
					_elemente.push_back(testPrim);
				}
			}
			
		}
	}

If someone could help me i will be gratefull.