Re: [boost] [Block Pointer] make_block

Subject: Re: [boost] [Block Pointer] make_block
From: TONGARI (tongari95_at_[hidden])
Date: 2011-04-30 15:14:25

2011/5/1 Phil Bouchard <philippe_at_[hidden]>

> On 4/30/2011 9:59 AM, Phil Bouchard wrote:
>
>> On 4/30/2011 8:05 AM, Mathias Gaunard wrote:
>>
>>> On 30/04/2011 02:38, Phil Bouchard wrote:
>>>
>>>>
>>>> time of new block:
>>>> 0.144u 0.016s 0:00.16 93.7%
>>>>
>>>> time of make_block:
>>>> 0.328u 0.012s 0:00.34 97.0%
>>>>
>>>> Any thoughts?
>>>>
>>>
>>> There is no difference between
>>>
>>> block_ptr<T> a = make_block<T>(whatever);
>>> and
>>> block_ptr<T> a(new block<T>(whatever));
>>>
>>> Your temporaries in question are removed by NRVO.
>>>
>>
>> That's right, with the optimization flags turned on I get:
>> 0.116u 0.004s 0:00.12 91.6%
>>
>> (This is block_ptr_test3 BTW)
>>
>
> Sorry operator new is still faster with optimization flags turned on:
> time of new block (O3):
> 0.044u 0.040s 0:00.09 88.8%
>
> time of make_block (O3):
>
> 0.116u 0.004s 0:00.12 91.6%
>

What if
    block_ptr<T> a(make_block<T>(whatever));
     v.s.
    block_ptr<T> a(new block<T>(whatever));
?