2.5.3 decltype类型指示符

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书中页数：P62
代码名称：decl-ex.cc

#include <iostream>
using std::cout; using std::endl;

int main()
{
	int a = 0;
	decltype(a) c = a;   // c is an int
	decltype((a)) d = a; // d is a reference to a
	++c;                 // increments c, a (and d) unchanged
	cout << "a: " << a << " c: " << c << " d: " << d << endl;
	++d;                 // increments a through the reference d
	cout << "a: " << a << " c: " << c << " d: " << d << endl;
	
	int A = 0, B = 0;
	decltype((A)) C = A;   // C is a reference to A
	decltype(A = B) D = A; // D is also a reference to A
	++C;
	cout << "A: " << A << " C: " << C << " D: " << D << endl;
	++D;
	cout << "A: " << A << " C: " << C << " D: " << D << endl;
	
	return 0;
}