Re: [boost] [review] The review of Boost.DoubleEnded starts today: September 21 - September 30

Subject: Re: [boost] [review] The review of Boost.DoubleEnded starts today: September 21 - September 30
From: Soul Studios (matt_at_[hidden])
Date: 2017-09-27 02:18:57

> With std::deque you cannot control the segment size, and 
> implementations differ widely. Is it not obvious that having a block 
> size of 1 or 2 (as e.g. visual c++ does) is very fast.
>

Visual studio's implementation is almost brokenly slow compared to others.

> That iteration over a deque can be slow has been known for two 
> decades, Matt Austern wrote an article about it.
>

Not true.
Libstdc++'s implementation iterates almost as fast as vector except for 
large structs (due to a fixed memory-based block size). 
http://www.plflib.org/benchmarks_haswell_gcc.htm#rawperformance
M