diff options
Diffstat (limited to 'src/sync.h')
| -rw-r--r-- | src/sync.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/src/sync.h b/src/sync.h index 0948083c7f..faabec2c2d 100644 --- a/src/sync.h +++ b/src/sync.h @@ -256,7 +256,22 @@ using DebugLock = UniqueLock<typename std::remove_reference<typename std::remove //! //! int val = WITH_LOCK(cs, return shared_val); //! -#define WITH_LOCK(cs, code) [&] { LOCK(cs); code; }() +//! Note: +//! +//! Since the return type deduction follows that of decltype(auto), while the +//! deduced type of: +//! +//! WITH_LOCK(cs, return {int i = 1; return i;}); +//! +//! is int, the deduced type of: +//! +//! WITH_LOCK(cs, return {int j = 1; return (j);}); +//! +//! is &int, a reference to a local variable +//! +//! The above is detectable at compile-time with the -Wreturn-local-addr flag in +//! gcc and the -Wreturn-stack-address flag in clang, both enabled by default. +#define WITH_LOCK(cs, code) [&]() -> decltype(auto) { LOCK(cs); code; }() class CSemaphore { |