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cppdraft/atomics/alias.md

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+[atomics.alias]
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+# 32 Concurrency support library [[thread]](./#thread)
+
+## 32.5 Atomic operations [[atomics]](atomics#alias)
+
+### 32.5.3 Type aliases [atomics.alias]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L2857)
+
+The type aliases atomic_intN_t, atomic_uintN_t,atomic_intptr_t, and atomic_uintptr_t are defined if and only ifintN_t, uintN_t,intptr_t, and uintptr_t are defined, respectively[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L2865)
+
+The type aliasesatomic_signed_lock_free and atomic_unsigned_lock_free name specializations of atomic whose template arguments are integral types, respectively signed and unsigned,
+and whose is_always_lock_free property is true[.](#2.sentence-1)
+
+[*Note [1](#note-1)*:
+
+These aliases are optional in freestanding implementations ([[compliance]](compliance "16.4.2.5 Freestanding implementations"))[.](#2.sentence-2)
+
+— *end note*]
+
+Implementations should choose for these aliases
+the integral specializations of atomic for which the atomic waiting and notifying operations ([[atomics.wait]](atomics.wait "32.5.6 Waiting and notifying"))
+are most efficient[.](#2.sentence-3)