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Fix -Wignored-reference-qualifiers #3677

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Fix -Wignored-reference-qualifiers #3677

wants to merge 1 commit into from

Commits on Aug 5, 2022

  1. Fix -Wignored-reference-qualifiers 

    In certain STLs, `std::vector<bool>::reference` is just `bool&`.
Prepending `const` causes the following warning:
```
include/nlohmann/detail/conversions/to_json.hpp:271:42: error: 'const' qualifier on reference type 'std::vector<bool>::reference' (aka 'bool &') has no effect [-Werror,-Wignored-reference-qualifiers]
```

This PR fixes the problem.
    @georgthegreat
    georgthegreat committed Aug 5, 2022
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