Do not pretend to default initialize a device lambda

Found in CCCL CI

Author: miscco

cpp/src/prims/count_if_v.cuh

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2024, NVIDIA CORPORATION.
+ * Copyright (c) 2020-2025, NVIDIA CORPORATION.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,9 +35,9 @@ namespace detail {
 
 template <typename vertex_t, typename VertexValueInputIterator, typename VertexOp>
 struct count_if_call_v_op_t {
-  vertex_t local_vertex_partition_range_first{};
-  VertexValueInputIterator vertex_value_input_first{};
-  VertexOp v_op{};
+  vertex_t local_vertex_partition_range_first;
+  VertexValueInputIterator vertex_value_input_first;
+  VertexOp v_op;
 
   __device__ bool operator()(vertex_t i)
   {

cpp/src/prims/transform_reduce_v.cuh

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020-2024, NVIDIA CORPORATION.
+ * Copyright (c) 2020-2025, NVIDIA CORPORATION.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,9 +36,9 @@ namespace detail {
 
 template <typename vertex_t, typename VertexValueInputIterator, typename VertexOp, typename T>
 struct transform_reduce_call_v_op_t {
-  vertex_t local_vertex_partition_range_first{};
-  VertexValueInputIterator vertex_value_input_first{};
-  VertexOp v_op{};
+  vertex_t local_vertex_partition_range_first;
+  VertexValueInputIterator vertex_value_input_first;
+  VertexOp v_op;
 
   __device__ T operator()(vertex_t i)
   {

cpp/src/prims/update_v_frontier.cuh

@@ -51,10 +51,10 @@ template <typename vertex_t,
           typename key_t,
           typename payload_t>
 struct update_v_frontier_call_v_op_t {
-  VertexValueInputIterator vertex_value_input_first{};
-  VertexValueOutputIterator vertex_value_output_first{};
-  VertexOp v_op{};
-  vertex_t local_vertex_partition_range_first{};
+  VertexValueInputIterator vertex_value_input_first;
+  VertexValueOutputIterator vertex_value_output_first;
+  VertexOp v_op;
+  vertex_t local_vertex_partition_range_first;
 
   __device__ uint8_t operator()(thrust::tuple<key_t, payload_t> pair) const
   {
@@ -87,10 +87,10 @@ struct update_v_frontier_call_v_op_t<vertex_t,
                                      VertexOp,
                                      key_t,
                                      void> {
-  VertexValueInputIterator vertex_value_input_first{};
-  VertexValueOutputIterator vertex_value_output_first{};
-  VertexOp v_op{};
-  vertex_t local_vertex_partition_range_first{};
+  VertexValueInputIterator vertex_value_input_first;
+  VertexValueOutputIterator vertex_value_output_first;
+  VertexOp v_op;
+  vertex_t local_vertex_partition_range_first;
 
   __device__ uint8_t operator()(key_t key) const
   {