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| author | Nobuyoshi Nakada <nobu@ruby-lang.org> | 2023-02-04 01:31:56 +0900 |
|---|---|---|
| committer | Nobuyoshi Nakada <nobu@ruby-lang.org> | 2023-02-14 15:18:21 +0900 |
| commit | 2490b2e1216f02aa896abdf121a28e50cac107c3 (patch) | |
| tree | 8d76b8bae254eb4f2d9083fe8f52c661230d6cab /include/ruby/util.h | |
| parent | 45f0e3a673964069a4c9c57ce8665cbc21ac267f (diff) | |
| download | ruby-2490b2e1216f02aa896abdf121a28e50cac107c3.tar.gz | |
Add utility macros `DECIMAL_SIZE_OF` and `DECIMAL_SIZE_OF_BYTES`
Diffstat (limited to 'include/ruby/util.h')
| -rw-r--r-- | include/ruby/util.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/ruby/util.h b/include/ruby/util.h index e8727a3200..ee11bc940a 100644 --- a/include/ruby/util.h +++ b/include/ruby/util.h @@ -36,6 +36,15 @@ RBIMPL_SYMBOL_EXPORT_BEGIN() /** an approximation of ceil(n * log10(2)), up to 65536 at least */ #define DECIMAL_SIZE_OF_BITS(n) (((n) * 3010 + 9998) / 9999) +/** an approximation of decimal representation size for n-bytes */ +#define DECIMAL_SIZE_OF_BYTES(n) DECIMAL_SIZE_OF_BITS((n) * CHAR_BIT) + +/** + * An approximation of decimal representation size. `expr` may be a + * type name + */ +#define DECIMAL_SIZE_OF(expr) DECIMAL_SIZE_OF_BYTES(sizeof(expr)) + /** * Character to number mapping like `'a'` -> `10`, `'b'` -> `11` etc. For * punctuation etc., the value is -1. "36" terminology comes from the fact |