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c++: introduce api.value.automove

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Based on work by Frank Heckenbach.
See http://lists.gnu.org/archive/html/bug-bison/2018-04/msg00000.html
and http://lists.gnu.org/archive/html/bug-bison/2018-09/msg00019.html.

* data/lalr1.cc (b4_rhs_value): Use YY_MOVE api.rhs.automove is set.
* doc/bison.texi (%define Summary): Document api.rhs.automove.
* examples/variant-11.yy: Use it.

* tests/local.at (AT_AUTOMOVE_IF): New.
* tests/c++.at (Variants): Check move semantics.
This commit is contained in:
Akim Demaille
2018-09-18 19:57:32 +02:00
parent aa5de5728c
commit 3eb9042a30
5 changed files with 141 additions and 4 deletions
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7
data/lalr1.cc
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@@ -83,9 +83,14 @@ m4_define([b4_rhs_state],
# --------------------------------------
# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
# symbols on RHS.
m4_define([b4_rhs_value],
m4_define([_b4_rhs_value],
[b4_symbol_value([b4_rhs_data([$1], [$2]).value], [$3])])
m4_define([b4_rhs_value],
[b4_percent_define_ifdef([api.value.automove],
[YY_MOVE(_b4_rhs_value($@))],
[_b4_rhs_value($@)])])
# b4_rhs_location(RULE-LENGTH, NUM)
# ---------------------------------