28 Text processing library [text]

28.3 Localization library [localization]

28.3.4 Standard locale categories [locale.categories]

28.3.4.3 The numeric category [category.numeric]

28.3.4.3.3 Class template num_put [locale.nm.put]

28.3.4.3.3.3 Virtual functions [facet.num.put.virtuals]