boost::mpl学习日记1

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记录一下mpl学习结果：

引用

1-1.
    Turn vector_c into a type sequence with elements (2,3,4) using transform.

对vector做一个加1就可以了

	
typedef mpl::vector_c	AAA;
typedef mpl::vector_c	CCC;
typedef mpl::transform > >::type BBB;
BOOST_STATIC_ASSERT((
	mpl::equal::type::value
	));

引用

1-2.
    Turn vector_c into a type sequence with elements (1,4,9) using transform.

对两个AAA相乘

typedef mpl::vector_c	DDD;

typedef mpl::transform  >::type EEE;
BOOST_STATIC_ASSERT((
	mpl::equal::type::value
	));

引用

1-5.

    There's still a problem with the dimensional analysis code in section 1.1. Hint: What happens when you do:

    f = f + m * a;

    Repair this example using techniques shown in this chapter.

加法操作支持两种类型，然后确保类型是一致的就可以了

template 
quantity
operator+(quantity x, quantity y)
{
	BOOST_STATIC_ASSERT((
		mpl::equal::type::value
		));
	return quantity(x.value() + y.value());
}