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Make is_lock_free constexpr.

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This makes it possible to use it in `static_assert`, which is better
than a runtime error.
This commit is contained in:
Charles-Francois Natali
2021-11-24 13:43:30 +00:00
parent feb72d0ed6
commit 14838d1f6f
3 changed files with 4 additions and 4 deletions
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2
blockingconcurrentqueue.h
View File

@@ -544,7 +544,7 @@ public:
// Returns true if the underlying atomic variables used by
// the queue are lock-free (they should be on most platforms).
// Thread-safe.
static bool is_lock_free()
static constexpr bool is_lock_free()
{
return ConcurrentQueue::is_lock_free();
}

2
concurrentqueue.h
View File

@@ -1314,7 +1314,7 @@ public:
// Returns true if the underlying atomic variables used by
// the queue are lock-free (they should be on most platforms).
// Thread-safe.
static bool is_lock_free()
static constexpr bool is_lock_free()
{
return
details::static_is_lock_free<bool>::value == 2 &&

4
tests/unittests/unittests.cpp
View File

@@ -3643,9 +3643,9 @@ public:
// is_lock_free()
{
bool lockFree = ConcurrentQueue<Foo, Traits>::is_lock_free();
constexpr bool lockFree = ConcurrentQueue<Foo, Traits>::is_lock_free();
#if defined(__amd64__) || defined(_M_X64) || defined(__x86_64__) || defined(_M_IX86) || defined(__i386__) || defined(_M_PPC) || defined(__powerpc__)
ASSERT_OR_FAIL(lockFree);
static_assert(lockFree, "is_lock_free should be true");
#else
(void)lockFree;
#endif