[ratio.syn] Use digit separators to make large numbers more readable.

Author: zygoloid

source/utilities.tex

@@ -10296,26 +10296,26 @@
   template <class R1, class R2> struct ratio_greater_equal;
 
   // \ref{ratio.si}, convenience SI typedefs
-  typedef ratio<1, 1000000000000000000000000> yocto;  // \seebelow
-  typedef ratio<1,    1000000000000000000000> zepto;  // \seebelow
-  typedef ratio<1,       1000000000000000000> atto;
-  typedef ratio<1,          1000000000000000> femto;
-  typedef ratio<1,             1000000000000> pico;
-  typedef ratio<1,                1000000000> nano;
-  typedef ratio<1,                   1000000> micro;
-  typedef ratio<1,                      1000> milli;
-  typedef ratio<1,                       100> centi;
-  typedef ratio<1,                        10> deci;
-  typedef ratio<                       10, 1> deca;
-  typedef ratio<                      100, 1> hecto;
-  typedef ratio<                     1000, 1> kilo;
-  typedef ratio<                  1000000, 1> mega;
-  typedef ratio<               1000000000, 1> giga;
-  typedef ratio<            1000000000000, 1> tera;
-  typedef ratio<         1000000000000000, 1> peta;
-  typedef ratio<      1000000000000000000, 1> exa;
-  typedef ratio<   1000000000000000000000, 1> zetta;  // \seebelow
-  typedef ratio<1000000000000000000000000, 1> yotta;  // \seebelow
+  typedef ratio<1, 1'000'000'000'000'000'000'000'000> yocto;  // \seebelow
+  typedef ratio<1,     1'000'000'000'000'000'000'000> zepto;  // \seebelow
+  typedef ratio<1,         1'000'000'000'000'000'000> atto;
+  typedef ratio<1,             1'000'000'000'000'000> femto;
+  typedef ratio<1,                 1'000'000'000'000> pico;
+  typedef ratio<1,                     1'000'000'000> nano;
+  typedef ratio<1,                         1'000'000> micro;
+  typedef ratio<1,                             1'000> milli;
+  typedef ratio<1,                               100> centi;
+  typedef ratio<1,                                10> deci;
+  typedef ratio<                               10, 1> deca;
+  typedef ratio<                              100, 1> hecto;
+  typedef ratio<                            1'000, 1> kilo;
+  typedef ratio<                        1'000'000, 1> mega;
+  typedef ratio<                    1'000'000'000, 1> giga;
+  typedef ratio<                1'000'000'000'000, 1> tera;
+  typedef ratio<            1'000'000'000'000'000, 1> peta;
+  typedef ratio<        1'000'000'000'000'000'000, 1> exa;
+  typedef ratio<    1'000'000'000'000'000'000'000, 1> zetta;  // \seebelow
+  typedef ratio<1'000'000'000'000'000'000'000'000, 1> yotta;  // \seebelow
 }
 \end{codeblock}