c++17 concepts with CPP_template for engine/*.{cpp,h} files

[sebastian-wieczorek]

Backport the (few) occurences of C++20 concepts in the src/engine subdirecotory to C++17 using macros from range-v3.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.04%. Comparing base (a307781) to head (416852d).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1779      +/-   ##
==========================================
+ Coverage   90.00%   90.04%   +0.03%     
==========================================
  Files         395      395              
  Lines       37838    37909      +71     
  Branches     4258     4264       +6     
==========================================
+ Hits        34055    34134      +79     
+ Misses       2484     2478       -6     
+ Partials     1299     1297       -2     

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[joka921]

Thank you, I have given the anonymous namespace an explicit name (Sonarcloud correctly complains about anonymous namespaces in the header). As soon as the checks have run through I am going to merge this.

[sparql-conformance]

Conformance check passed ✅

No test result changes.

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=416852d6c3f4bc098ebc4837025794c79c93f561&prev=551288e03ea264e60a67667c295a66c596cc6e50

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud