Any difference between class and typename identifier? - 未名空间MITBBS历史存档

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Any difference between class and typename identifier?

Any difference between class and typename identifier?# Programming - 葵花宝典

h*i2006-12-10 08:12

1 楼

C++ has two ways to specify a formal parameter for a template:
class identifier
typename identifier
are there any difference between thetwo notations? If so, what are they?

t*t2006-12-10 08:12

2 楼

in template parameter no difference.

【在 h**i 的大作中提到】

: C++ has two ways to specify a formal parameter for a template:
: class identifier
: typename identifier
: are there any difference between thetwo notations? If so, what are they?

b*n2006-12-10 08:12

3 楼

不全对。如果template parameter是一个template class，就一定要用class，
不能用typename。

【在 t****t 的大作中提到】

: in template parameter no difference.

c*e2006-12-10 08:12

4 楼

never heard of this. and i definitely used typename in the case u
described.

【在 b********n 的大作中提到】

: 不全对。如果template parameter是一个template class，就一定要用class，
: 不能用typename。

t*t2006-12-10 08:12

5 楼

hmm, i am not sure on this
template class K> ...
maybe you can not use "typename K" here. but what i meant is, when they can
both be used then they are equivalent [14.1, clause 2]

【在 c********e 的大作中提到】

: never heard of this. and i definitely used typename in the case u
: described.

p*u2006-12-10 08:12

6 楼

C++ templates: the complete guide page 51, K has to be declared by
keyword class, while T can be typename.

can

【在 t****t 的大作中提到】

: hmm, i am not sure on this
: template class K> ...
: maybe you can not use "typename K" here. but what i meant is, when they can
: both be used then they are equivalent [14.1, clause 2]