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refactor: Work around GCC 9 -Wredundant-move warning

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Use std::move workaround for unique_ptr, for when the C++ compiler lacks
a fix for this issue:
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1579
Do this in a way that avoids a GCC 9 `-Wredundant-move` warning.
This commit is contained in:
Russell Yanofsky 2019-10-01 14:00:46 +02:00 committed by Wladimir J. van der Laan
parent b837b334db
commit ff9c671b11
1 changed files with 4 additions and 5 deletions
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9
src/interfaces/chain.cpp
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@ -236,11 +236,10 @@ public:
explicit ChainImpl(NodeContext& node) : m_node(node) {}
std::unique_ptr<Chain::Lock> lock(bool try_lock) override
{
auto result = MakeUnique<LockImpl>(::cs_main, "cs_main", __FILE__, __LINE__, try_lock);
if (try_lock && result && !*result) return {};
// std::move necessary on some compilers due to conversion from
// LockImpl to Lock pointer
return std::move(result);
auto lock = MakeUnique<LockImpl>(::cs_main, "cs_main", __FILE__, __LINE__, try_lock);
if (try_lock && lock && !*lock) return {};
std::unique_ptr<Chain::Lock> result = std::move(lock); // Temporary to avoid CWG 1579
return result;
}
bool findBlock(const uint256& hash, CBlock* block, int64_t* time, int64_t* time_max) override
{