This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 110c. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2023-02-07


1104. Global-scope template arguments vs the <: digraph

Section: 5.5  [lex.digraph]     Status: C++11     Submitter: US     Date: 2010-08-02

[Voted into the WP at the November, 2010 meeting.]

N3092 comment US 15

Passing a name qualified by the global scope operator :: as a template argument can inadvertently trigger recognition of the <: digraph, causing a syntax error. This should be handled by a lexical rule similar to the special treament given to >> so that <:: would be recognized as an open angle-bracket followed by the scope-resolution operator.

Proposed resolution (August, 2010):

Insert a bullet into the list in 5.4 [lex.pptoken] paragraph 3 as follows:

If the input stream has been parsed into preprocessing tokens up to a given character: