[testing] Add a runnable regression test for vector arguments. (#2708)

This test is intended to fail if passing vectors of different
lengths stops working correctly. Vectors used as state initializers
must be a power of 2 in length.

Signed-off-by: Eric Schweitz <[email protected]>

Author: schweitzpgi

targettests/execution/vector-1.cpp

@@ -0,0 +1,60 @@
+/*******************************************************************************
+ * Copyright (c) 2022 - 2025 NVIDIA Corporation & Affiliates.                  *
+ * All rights reserved.                                                        *
+ *                                                                             *
+ * This source code and the accompanying materials are made available under    *
+ * the terms of the Apache License 2.0 which accompanies this distribution.    *
+ ******************************************************************************/
+
+// Test for std::vector support
+
+// RUN: nvq++ %cpp_std %s -o %t && %t | FileCheck %s
+
+#include <cstdio>
+#include <cudaq.h>
+
+struct vector3 {
+  bool operator()(std::vector<double> theta) __qpu__ {
+    return theta.size() == 3;
+  }
+};
+
+struct vector5 {
+  bool operator()(std::vector<double> theta) __qpu__ {
+    return theta.size() == 5;
+  }
+};
+
+struct vectorPow2a {
+  bool operator()(std::vector<double> init) __qpu__ {
+    cudaq::qvector q(init);
+    return true;
+  }
+};
+
+struct vectorPow2b {
+  bool operator()(std::vector<double> init) __qpu__ {
+    cudaq::qvector q(init);
+    return true;
+  }
+};
+
+int main() {
+  bool b = true;
+  std::vector<double> v = {1.0, 2.0, 3.0};
+  b &= vector3{}(v);
+  v.push_back(4.0);
+  v.push_back(5.0);
+  b &= vector5{}(v);
+  v.pop_back();
+  b &= vectorPow2a{}(v);
+  std::vector<double> w{v};
+  v.insert(v.end(), w.begin(), w.end());
+  w.clear();
+  b &= vectorPow2b{}(v);
+  if (b)
+    printf("success\n");
+  return b ? 0 : ~0;
+}
+
+// CHECK: success

test/AST-Quake/vector.cpp test/AST-Quake/vector-0.cpp

@@ -8,7 +8,7 @@
 
 // Test for std::vector support
 
-// RUN: cudaq-quake %cpp_std %s  | FileCheck %s
+// RUN: cudaq-quake %cpp_std %s | FileCheck %s
 
 #include <cudaq.h>
 #include <cudaq/algorithm.h>