cpp atomic good example

Author: bung87

compiler/semstmts.nim

@@ -716,7 +716,8 @@ proc semVarOrLet(c: PContext, n: PNode, symkind: TSymKind): PNode =
         let actualType = v.typ.skipTypes({tyGenericInst, tyAlias,
                                           tyUserTypeClassInst})
         if actualType.kind in {tyObject, tyDistinct} and
-           actualType.requiresInit:
+           actualType.requiresInit and not (sfImportc in actualType.sym.flags):
+           # imported type use requiresInit pragma prevent implicit initialization
           defaultConstructionError(c, v.typ, v.info)
         else:
           checkNilable(c, v)

tests/cpp/tatomic.nim

@@ -0,0 +1,13 @@
+discard """
+  targets: "cpp"
+  action: compile
+"""
+import atomics
+
+template relaxed*[T](location: var Atomic[T], value: T) =
+  ## use template avoid copy Atomic[T] to temporary variable
+  location.store(value, moRelaxed)
+
+var atom: Atomic[int]
+atom.relaxed(1)
+atom.relaxed(2)