C++ 对字符文字的顺序有什么保证？
What guarantees does C++ make about the ordering of character literals?
C++ 对字符文字的顺序有什么保证？ 基本源字符集中的字符有明确的顺序吗？ （例如 'a' < 'z' 一定是真的吗？'A' < 'z' 怎么样？）
该标准仅提供对十进制数字 0 到 9 的排序的保证，来自草案 C++11 标准部分 2.3 [lex.charset]:
In both the source and execution basic character sets, the value of
each character after 0 in the above list of decimal digits shall be
one greater than the value of the previous.
否则说（强调我的）：
The basic execution character set and the basic execution
wide-character set shall each contain all the members of the basic
source character set, plus control characters representing alert,
backspace, and carriage return, plus a null character (respectively,
null wide character), whose representation has all zero bits. For each
basic execution character set, the values of the members shall be
non-negative and distinct from one another.
注意，EBCDIC 有一个不连续的字符集。
C++ 对字符文字的顺序有什么保证？ 基本源字符集中的字符有明确的顺序吗？ （例如 'a' < 'z' 一定是真的吗？'A' < 'z' 怎么样？）
该标准仅提供对十进制数字 0 到 9 的排序的保证，来自草案 C++11 标准部分 2.3 [lex.charset]:
In both the source and execution basic character sets, the value of each character after 0 in the above list of decimal digits shall be one greater than the value of the previous.
否则说（强调我的）：
The basic execution character set and the basic execution wide-character set shall each contain all the members of the basic source character set, plus control characters representing alert, backspace, and carriage return, plus a null character (respectively, null wide character), whose representation has all zero bits. For each basic execution character set, the values of the members shall be non-negative and distinct from one another.
注意，EBCDIC 有一个不连续的字符集。