[GPU] Use optional and nested namespaces features from cpp17

src/plugins/intel_gpu/include/intel_gpu/op/convolution.hpp

@@ -6,9 +6,7 @@
 
 #include "openvino/op/util/convolution_base.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 // Common node for v1::Convolution and v1::GroupConvolution with few extensions
 //  - Relaxed type requirements
@@ -76,6 +74,4 @@ std::vector<ov::PartialShape> shape_infer(const Convolution* op,
                                           CoordinateDiff& pads_begin,
                                           CoordinateDiff& pads_end);
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/fully_connected.hpp

@@ -7,9 +7,7 @@
 #include "openvino/core/node.hpp"
 #include "openvino/op/op.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 class FullyConnected : public ov::op::Op {
 public:
@@ -34,6 +32,4 @@ class FullyConnected : public ov::op::Op {
     ov::element::Type m_output_type;
 };
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/fully_connected_compressed.hpp

@@ -6,9 +6,7 @@
 
 #include "fully_connected.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 class FullyConnectedCompressed : public FullyConnected {
 public:
@@ -42,6 +40,4 @@ class FullyConnectedCompressed : public FullyConnected {
     std::shared_ptr<Node> clone_with_new_inputs(const ov::OutputVector& new_args) const override;
 };
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/gemm.hpp

@@ -9,9 +9,7 @@
 #include "openvino/op/matmul.hpp"
 #include "openvino/op/op.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 class Gemm : public ov::op::v0::MatMul {
 public:
@@ -56,6 +54,4 @@ std::vector<ov::PartialShape> shape_infer(const Gemm* op,
                                           const std::vector<int64_t>& order_b,
                                           const std::vector<int64_t>& order_c);
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/indirect_gemm.hpp

@@ -9,9 +9,7 @@
 #include "openvino/core/partial_shape.hpp"
 #include "openvino/op/op.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 class IndirectGemm : public ov::intel_gpu::op::Gemm {
 public:
@@ -49,6 +47,4 @@ class IndirectGemm : public ov::intel_gpu::op::Gemm {
     int64_t m_indirect_axis = 0;
 };
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/indirect_sdpa.hpp

@@ -9,9 +9,7 @@
 #include "openvino/core/partial_shape.hpp"
 #include "openvino/op/op.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 class IndirectSDPA : public ov::intel_gpu::op::SDPA {
 public:
@@ -55,6 +53,4 @@ class IndirectSDPA : public ov::intel_gpu::op::SDPA {
     int64_t m_indirect_axis = -1;
 };
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/kv_cache.hpp

@@ -9,9 +9,7 @@
 #include "openvino/op/util/variable_extension.hpp"
 #include "ov_ops/dynamic_quantize.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 /// \brief Operator that implements Key-Values cache subgraph for large language models.
 /// This operation updates data of the corresponding Variable
@@ -71,6 +69,4 @@ class KVCache : public ov::op::Op, public ov::op::util::VariableExtension {
 
 std::vector<ov::PartialShape> shape_infer(const KVCache* op, const std::vector<ov::PartialShape>& input_shapes);
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/kv_cache_compressed.hpp

@@ -7,9 +7,7 @@
 #include "intel_gpu/op/kv_cache.hpp"
 #include "ov_ops/dynamic_quantize.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 /// \brief Operator that implements Key-Values cache subgraph for large language models.
 /// This operation updates data of the corresponding Variable
@@ -51,6 +49,4 @@ class KVCacheCompressed : public ov::intel_gpu::op::KVCache {
 std::vector<ov::PartialShape> shape_infer(const KVCacheCompressed* op,
                                           const std::vector<ov::PartialShape>& input_shapes);
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/placeholder.hpp

@@ -6,9 +6,7 @@
 
 #include "openvino/op/op.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 class Placeholder : public ov::op::Op {
 public:
@@ -21,6 +19,4 @@ class Placeholder : public ov::op::Op {
     std::shared_ptr<Node> clone_with_new_inputs(const ov::OutputVector& new_args) const override;
 };
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/read_value.hpp

@@ -8,9 +8,7 @@
 #include "openvino/op/util/variable.hpp"
 #include "openvino/op/util/variable_extension.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 /// \brief Similar to common v6::ReadValue, but it's not derived from ReadValueBase class to avoid ReadValue-Assign pairing check
 /// This is needed to have ReadValue-KVCache pair instead of ReadValue-Assign
@@ -42,6 +40,4 @@ class ReadValue : public ov::op::Op, public ov::op::util::VariableExtension {
     }
 };
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/read_values.hpp

@@ -6,9 +6,7 @@
 
 #include "intel_gpu/op/read_value.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 /// \brief This operation handles the OpenVINO GPU Plugin's custom variable
 //         representation (which can store multiple states in a single variable) at the graph level.
@@ -37,6 +35,4 @@ class ReadValues : public ReadValue {
     std::vector<ov::op::util::VariableInfo> m_internal_states_infos;
 };
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/op/sdpa.hpp

@@ -10,9 +10,7 @@
 #include "openvino/op/scaled_dot_product_attention.hpp"
 #include "ov_ops/dynamic_quantize.hpp"
 
-namespace ov {
-namespace intel_gpu {
-namespace op {
+namespace ov::intel_gpu::op {
 
 class SDPA : public ov::op::v13::ScaledDotProductAttention {
 public:
@@ -83,6 +81,4 @@ std::vector<ov::PartialShape> shape_infer(const SDPA* op,
                                           const std::vector<int64_t>& order_out);
 
 
-}   // namespace op
-}   // namespace intel_gpu
-}   // namespace ov
+}   // namespace ov::intel_gpu::op

src/plugins/intel_gpu/include/intel_gpu/plugin/async_infer_request.hpp

@@ -6,11 +6,8 @@
 
 #include "openvino/runtime/iasync_infer_request.hpp"
 #include "intel_gpu/plugin/sync_infer_request.hpp"
-#include <string>
-#include <map>
 
-namespace ov {
-namespace intel_gpu {
+namespace ov::intel_gpu {
 
 class AsyncInferRequest : public ov::IAsyncInferRequest {
 public:
@@ -29,5 +26,4 @@ class AsyncInferRequest : public ov::IAsyncInferRequest {
     std::shared_ptr<ov::threading::ITaskExecutor> m_wait_executor;
 };
 
-}  // namespace intel_gpu
-}  // namespace ov
+}  // namespace ov::intel_gpu

src/plugins/intel_gpu/include/intel_gpu/plugin/common_utils.hpp

@@ -8,7 +8,7 @@
 #include <tuple>
 #include "intel_gpu/runtime/layout.hpp"
 #include "intel_gpu/runtime/memory.hpp"
-#include "intel_gpu/runtime/optionals.hpp"
+
 #include "intel_gpu/runtime/shape_predictor.hpp"
 #include "openvino/core/layout.hpp"
 #include "openvino/core/node.hpp"

src/plugins/intel_gpu/include/intel_gpu/plugin/compiled_model.hpp

@@ -17,8 +17,7 @@
 #include "intel_gpu/runtime/execution_config.hpp"
 #include "openvino/runtime/icompiled_model.hpp"
 
-namespace ov {
-namespace intel_gpu {
+namespace ov::intel_gpu {
 
 class CompiledModel : public ov::ICompiledModel {
 public:
@@ -74,5 +73,4 @@ class CompiledModel : public ov::ICompiledModel {
     bool m_loaded_from_cache;
 };
 
-}  // namespace intel_gpu
-}  // namespace ov
+}  // namespace ov::intel_gpu

src/plugins/intel_gpu/include/intel_gpu/plugin/custom_layer.hpp

@@ -5,14 +5,12 @@
 #pragma once
 #include <memory>
 #include <string>
-#include <sstream>
 #include <vector>
 #include <map>
 #include "pugixml.hpp"
-#include "intel_gpu/runtime/tensor.hpp"
+#include "intel_gpu/runtime/format.hpp"
 
-namespace ov {
-namespace intel_gpu {
+namespace ov::intel_gpu {
 
 using CustomLayerPtr = std::shared_ptr<class CustomLayer>;
 using CustomLayerMap = std::map<std::string, CustomLayerPtr>;
@@ -82,5 +80,4 @@ class CustomLayer{
     std::string m_ErrorMessage;
 };
 
-}  // namespace intel_gpu
-}  // namespace ov
+}  // namespace ov::intel_gpu

src/plugins/intel_gpu/include/intel_gpu/plugin/graph.hpp

@@ -9,22 +9,18 @@
 #endif
 
 #include "intel_gpu/graph/network.hpp"
-#include "intel_gpu/graph/topology.hpp"
-#include "intel_gpu/plugin/custom_layer.hpp"
 #include "intel_gpu/plugin/remote_context.hpp"
 #include "intel_gpu/plugin/program_builder.hpp"
 
 #include <vector>
 #include <map>
-#include <set>
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 #include <condition_variable>
 
-namespace ov {
-namespace intel_gpu {
+namespace ov::intel_gpu {
 struct HostTimeProfilingEntry {
     int64_t inputs_processing = 0;
     int64_t enqueue = 0;
@@ -106,5 +102,4 @@ class Graph final {
     std::shared_ptr<ov::Model> get_runtime_model(std::vector<cldnn::primitive_info>& pi, bool filter_const_primitives = true);
 };
 
-}  // namespace intel_gpu
-}  // namespace ov
+}  // namespace ov::intel_gpu

src/plugins/intel_gpu/include/intel_gpu/plugin/multi_tensor_variable_state.hpp

@@ -6,8 +6,7 @@
 #include "intel_gpu/plugin/variable_state.hpp"
 #include "openvino/core/partial_shape.hpp"
 
-namespace ov {
-namespace intel_gpu {
+namespace ov::intel_gpu {
 
 class MultiTensorState : public VariableStateBase {
 public:
@@ -72,5 +71,4 @@ class VariableStateIndirectKVCacheCompressed : public VariableStateIndirectKVCac
 private:
     bool m_has_zp_state = false;
 };
-}  // namespace intel_gpu
-}  // namespace ov
+}  // namespace ov::intel_gpu

src/plugins/intel_gpu/include/intel_gpu/plugin/plugin.hpp

@@ -11,8 +11,7 @@
 #include <string>
 #include <memory>
 
-namespace ov {
-namespace intel_gpu {
+namespace ov::intel_gpu {
 
 class Plugin : public ov::IPlugin {
 private:
@@ -67,5 +66,4 @@ class Plugin : public ov::IPlugin {
     ov::SoPtr<ov::IRemoteContext> get_default_context(const ov::AnyMap& remote_properties) const override;
 };
 
-}  // namespace intel_gpu
-}  // namespace ov
+}  // namespace ov::intel_gpu

src/plugins/intel_gpu/include/intel_gpu/plugin/program_builder.hpp

@@ -48,8 +48,7 @@ void __register ## _ ## op_name ## _ ## op_version() {
        });                                                                                          \
 }
 
-namespace ov {
-namespace intel_gpu {
+namespace ov::intel_gpu {
 
 template<class T>
 struct is_smart_pointer : std::false_type {};
@@ -195,5 +194,4 @@ inline bool ends_with(const std::string& value, const std::string& suffix) {
     return std::equal(suffix.rbegin(), suffix.rend(), value.rbegin());
 }
 
-}  // namespace intel_gpu
-}  // namespace ov
+}  // namespace ov::intel_gpu

src/plugins/intel_gpu/include/intel_gpu/plugin/remote_context.hpp

@@ -21,8 +21,7 @@
 #include <memory>
 #include <atomic>
 
-namespace ov {
-namespace intel_gpu {
+namespace ov::intel_gpu {
 
 class RemoteContextImpl : public ov::IRemoteContext {
 public:
@@ -74,5 +73,4 @@ inline RemoteContextImpl::Ptr get_context_impl(ov::SoPtr<ov::IRemoteContext> ptr
     return casted;
 }
 
-}  // namespace intel_gpu
-}  // namespace ov
+}  // namespace ov::intel_gpu