Make literals readable

Reason

Readability.

Example

Use digit separators to avoid long strings of digits

auto c = 299'792'458; // m/s2
auto q2 = 0b0000'1111'0000'0000;
auto ss_number = 123'456'7890;

Example

Use literal suffixes where clarification is needed

auto hello = "Hello!"s; // a std::string
auto world = "world";   // a C-style string
auto interval = 100ms;  // using <chrono>

Note

Literals should not be sprinkled all over the code as "magic constants", but it is still a good idea to make them readable where they are defined. It is easy to make a typo in a long string of integers.

Enforcement

Flag long digit sequences. The trouble is to define "long"; maybe 7.