[WIP] What if alphabets were trivial?

[eseiler]

std::vector optimizes assignments to std::copy (basically memcpy) iff the value_type is trivial. If not, it will use std::unintialized_copy which will use placement-new and is around 2-3 times slower.

Method	Container	Alphabet	Iterations before	Iterations after
tag::assignment_operator	std::vector	seqan3::aa27	705	1853
tag::assignment_operator	std::vector	seqan3::dna4	741	1869
tag::assignment_operator	std::vector	seqan3::dna5	744	1879
tag::std_copy	std::vector	seqan3::aa27	1691	1871
tag::std_copy	std::vector	seqan3::dna4	1852	1800
tag::std_copy	std::vector	seqan3::dna5	1781	1865
tag::uninitialized_copy	std::vector	seqan3::aa27	711	1789
tag::uninitialized_copy	std::vector	seqan3::dna4	705	1856
tag::uninitialized_copy	std::vector	seqan3::dna5	727	1859
tag::assignment_operator	std::vector	seqan::AminoAcid	740	741
tag::assignment_operator	std::vector	seqan::Dna	733	726
tag::assignment_operator	std::vector	seqan::Dna5	747	727
tag::std_copy	std::vector	seqan::AminoAcid	1839	1811
tag::std_copy	std::vector	seqan::Dna	1766	1837
tag::std_copy	std::vector	seqan::Dna5	1830	1847
tag::uninitialized_copy	std::vector	seqan::AminoAcid	734	741
tag::uninitialized_copy	std::vector	seqan::Dna	742	739
tag::uninitialized_copy	std::vector	seqan::Dna5	731	735
tag::assignment_operator	seqan::String	seqan::AminoAcid	1835	1938
tag::assignment_operator	seqan::String	seqan::Dna	1819	1910
tag::assignment_operator	seqan::String	seqan::Dna5	1903	1944
tag::std_copy	seqan::String	seqan::AminoAcid	720	721
tag::std_copy	seqan::String	seqan::Dna	723	734
tag::std_copy	seqan::String	seqan::Dna5	723	726
tag::uninitialized_copy	seqan::String	seqan::AminoAcid	721	719
tag::uninitialized_copy	seqan::String	seqan::Dna	722	723
tag::uninitialized_copy	seqan::String	seqan::Dna5	719	728

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Name	Status	Preview	Updated
seqan3	✅ Ready (Inspect)	Visit Preview	Oct 18, 2022 at 11:35AM (UTC)

[codecov[bot]]

Codecov Report

Base: 98.21% // Head: 98.21% // Decreases project coverage by -0.00% :warning:

Coverage data is based on head (d0011c9) compared to base (c3113fa). Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3038      +/-   ##
==========================================
- Coverage   98.21%   98.21%   -0.01%     
==========================================
  Files         275      274       -1     
  Lines       12244    12204      -40     
==========================================
- Hits        12026    11986      -40     
  Misses        218      218              

Impacted Files	Coverage Δ
include/seqan3/alphabet/alphabet_base.hpp	100.00% <ø> (ø)
...clude/seqan3/alphabet/aminoacid/aminoacid_base.hpp	100.00% <ø> (ø)
include/seqan3/alphabet/aminoacid/aa20.hpp	100.00% <0.00%> (ø)
include/seqan3/alphabet/aminoacid/aa27.hpp	100.00% <0.00%> (ø)
include/seqan3/alphabet/structure/wuss.hpp	100.00% <0.00%> (ø)
include/seqan3/alphabet/nucleotide/dna4.hpp	100.00% <0.00%> (ø)
include/seqan3/alphabet/nucleotide/dna5.hpp	100.00% <0.00%> (ø)
include/seqan3/alphabet/nucleotide/rna4.hpp	100.00% <0.00%> (ø)
include/seqan3/alphabet/nucleotide/rna5.hpp	100.00% <0.00%> (ø)
... and 20 more

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[eseiler]

~~Blocked by https://github.com/seqan/seqan3/pull/3037~~