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This prevents constructing a Span<A> given two pointers into an array
of B (where B is a subclass of A), at least without explicit cast to
pointers to A.
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This matches a change in the C++20 std::span proposal.
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c31cbe7cfefc18123eb85ffb2ce509748435efde Add C++17 test to Travis (Pieter Wuille)
7829685e27aae25efb32e07368175c8f664b2218 Add configure option for c++17 (Pieter Wuille)
0fbde488b24f62b4bbbde216647941dcac65c81a Support conversion between Spans of compatible types (Pieter Wuille)
7cbfebbf3df0d26f518811e0bfb7abf270c83e37 Update ax_cxx_compile_stdcxx.m4 (Pieter Wuille)
Pull request description:
This adds a `--enable-c++17` option to the configure script, fixes the only C++17 incompatibility (with a commit taken from #18468), and adds a Travis test for it.
This is all off by default, and release builds remain C++11.
It implements the first step of the plan in https://github.com/bitcoin/bitcoin/issues/16684.
ACKs for top commit:
elichai:
tACK c31cbe7cfefc18123eb85ffb2ce509748435efde
practicalswift:
Tested ACK c31cbe7cfefc18123eb85ffb2ce509748435efde
hebasto:
ACK c31cbe7cfefc18123eb85ffb2ce509748435efde, tested on Linux Mint 19.3 both C++11 and C++17 modes. Compiled and passed tests locally.
Tree-SHA512: a4b00776dbceef9c12abbb404c6bcd48f7916ce24c8c7a14116355f64e817578b7fcddbedd5ce435322319d1e4de43429b68553f4d96d970c308fe3e3e59b9d1
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-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-
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This allows for very cheap transformations on the range of elements that
are to be passed to ExecuteWitnessScript.
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This introduces a rudimentary begin(), end(), operator[], and subspan to Span.
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