nlohmann / json / 1723

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travis-ci

:zap: micro-optimization of dump()

A lot of small changes to avoid memory allocations:

- The locale is only queried once rather than with every number
serialization.
- The indentation string is recycled between different calls.
- The string escape function avoids a copy if no escaping is necessary.
- The string escape and the space function use a complete switch case
instead of cascaded ifs.

Cachegrind measures some 15% performance improvement.

27 of 27 new or added lines in 1 file covered. (100.0%)

2863 of 2866 relevant lines covered (99.9%)

2349798.78 hits per line