Backport string_view_migration.h

ortools/base/BUILD.bazel

@@ -567,6 +567,12 @@ cc_library(
     deps = [":base"],
 )
 
+cc_library(
+    name = "string_view_migration",
+    hdrs = ["string_view_migration.h"],
+    deps = ["@abseil-cpp//absl/strings"],
+)
+
 cc_library(
     name = "strong_int",
     hdrs = ["strong_int.h"],

ortools/base/string_view_migration.h

@@ -0,0 +1,34 @@
+// Copyright 2010-2025 Google LLC
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef THIRD_PARTY_ORTOOLS_ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_
+#define THIRD_PARTY_ORTOOLS_ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+// This file contains helpers for various string_view migration efforts. These
+// are not intended to be stable long-term.
+
+namespace google::protobuf {
+
+inline std::string StringCopy(absl::string_view str) {
+  return std::string(str);
+}
+
+inline std::string StringCopy(const std::string& str) { return str; }
+
+}  // namespace google::protobuf
+
+#endif  // THIRD_PARTY_ORTOOLS_ORTOOLS_BASE_STRING_VIEW_MIGRATION_H_

ortools/linear_solver/wrappers/BUILD.bazel

@@ -37,6 +37,7 @@ cc_library(
     visibility = ["//visibility:public"],
     deps = [
         "//ortools/base:file",
+        "//ortools/base:string_view_migration",
         "//ortools/linear_solver:linear_solver_cc_proto",
         "//ortools/linear_solver:model_exporter",
         "//ortools/linear_solver:solve_mp_model",

ortools/linear_solver/wrappers/model_builder_helper.cc

@@ -30,6 +30,7 @@
 #include "absl/strings/str_join.h"
 #include "ortools/base/helpers.h"
 #include "ortools/base/options.h"
+#include "ortools/base/string_view_migration.h"
 #include "ortools/linear_solver/gurobi_util.h"
 #include "ortools/linear_solver/linear_solver.h"
 #include "ortools/linear_solver/linear_solver.pb.h"
@@ -183,7 +184,7 @@ double ModelBuilderHelper::VarObjectiveCoefficient(int var_index) const {
 }
 
 std::string ModelBuilderHelper::VarName(int var_index) const {
-  return std::string(model_.variable(var_index).name());
+  return google::protobuf::StringCopy(model_.variable(var_index).name());
 }
 
 int ModelBuilderHelper::AddLinearConstraint() {
@@ -259,7 +260,7 @@ double ModelBuilderHelper::ConstraintUpperBound(int ct_index) const {
 }
 
 std::string ModelBuilderHelper::ConstraintName(int ct_index) const {
-  return std::string(model_.constraint(ct_index).name());
+  return google::protobuf::StringCopy(model_.constraint(ct_index).name());
 }
 
 std::vector<int> ModelBuilderHelper::ConstraintVarIndices(int ct_index) const {
@@ -399,7 +400,8 @@ double ModelBuilderHelper::EnforcedConstraintUpperBound(int ct_index) const {
 
 std::string ModelBuilderHelper::EnforcedConstraintName(int ct_index) const {
   DCHECK(IsEnforcedConstraint(ct_index));
-  return std::string(model_.general_constraint(ct_index).name());
+  return google::protobuf::StringCopy(
+      model_.general_constraint(ct_index).name());
 }
 
 std::vector<int> ModelBuilderHelper::EnforcedConstraintVarIndices(
@@ -437,7 +439,7 @@ int ModelBuilderHelper::num_constraints() const {
 }
 
 std::string ModelBuilderHelper::name() const {
-  return std::string(model_.name());
+  return google::protobuf::StringCopy(model_.name());
 }
 
 void ModelBuilderHelper::SetName(const std::string& name) {
@@ -743,7 +745,7 @@ double ModelSolverHelper::activity(int ct_index) {
 
 std::string ModelSolverHelper::status_string() const {
   if (!has_response()) return "";
-  return std::string(response_.value().status_str());
+  return google::protobuf::StringCopy(response_.value().status_str());
 }
 
 double ModelSolverHelper::wall_time() const {

ortools/math_opt/core/BUILD.bazel

@@ -64,6 +64,7 @@ cc_library(
         "//ortools/base:status_macros",
         "//ortools/math_opt:model_cc_proto",
         "//ortools/math_opt:model_update_cc_proto",
+        "//ortools/base:string_view_migration",
         "@abseil-cpp//absl/algorithm:container",
         "@abseil-cpp//absl/container:flat_hash_map",
         "@abseil-cpp//absl/log:check",

ortools/math_opt/core/model_summary.h

@@ -32,6 +32,7 @@
 #include "absl/types/span.h"
 #include "ortools/base/linked_hash_map.h"
 #include "ortools/base/status_macros.h"
+#include "ortools/base/string_view_migration.h"
 #include "ortools/math_opt/model.pb.h"
 #include "ortools/math_opt/model_update.pb.h"
 
@@ -256,7 +257,8 @@ absl::Status UpdateBiMapFromMappedData(
   }
   absl::c_sort(new_ids);
   for (const int64_t id : new_ids) {
-    RETURN_IF_ERROR(bimap.Insert(id, std::string(proto_map.at(id).name())));
+    RETURN_IF_ERROR(bimap.Insert(
+        id, google::protobuf::StringCopy(proto_map.at(id).name())));
   }
   return absl::OkStatus();
 }

ortools/math_opt/cpp/BUILD.bazel

@@ -196,6 +196,7 @@ cc_library(
         ":variable_and_expressions",
         "//ortools/base:protoutil",
         "//ortools/base:status_macros",
+        "//ortools/base:string_view_migration",
         "//ortools/gscip:gscip_cc_proto",
         "//ortools/math_opt:result_cc_proto",
         "//ortools/math_opt:solution_cc_proto",
@@ -386,6 +387,7 @@ cc_library(
     srcs = ["streamable_solver_init_arguments.cc"],
     hdrs = ["streamable_solver_init_arguments.h"],
     deps = [
+        "//ortools/base:string_view_migration",
         "//ortools/math_opt:parameters_cc_proto",
         "//ortools/math_opt/solvers:gurobi_cc_proto",
         "@abseil-cpp//absl/status:statusor",

ortools/math_opt/cpp/solve_result.cc

@@ -33,6 +33,7 @@
 #include "absl/types/span.h"
 #include "ortools/base/protoutil.h"
 #include "ortools/base/status_macros.h"
+#include "ortools/base/string_view_migration.h"
 #include "ortools/math_opt/core/math_opt_proto_utils.h"
 #include "ortools/math_opt/cpp/linear_constraint.h"
 #include "ortools/math_opt/cpp/variable_and_expressions.h"
@@ -373,7 +374,7 @@ absl::StatusOr<Termination> Termination::FromProto(
     return absl::InvalidArgumentError("reason must be specified");
   }
   Termination result(/*is_maximize=*/false, *reason,
-                     std::string(termination_proto.detail()));
+                     google::protobuf::StringCopy(termination_proto.detail()));
   result.limit = EnumFromProto(termination_proto.limit());
   OR_ASSIGN_OR_RETURN3(
       result.problem_status,

ortools/math_opt/cpp/streamable_solver_init_arguments.cc

@@ -16,6 +16,7 @@
 #include <optional>
 
 #include "absl/status/statusor.h"
+#include "ortools/base/string_view_migration.h"
 #include "ortools/math_opt/parameters.pb.h"
 #include "ortools/math_opt/solvers/gurobi.pb.h"
 
@@ -34,10 +35,11 @@ GurobiInitializerProto::ISVKey GurobiISVKey::Proto() const {
 GurobiISVKey GurobiISVKey::FromProto(
     const GurobiInitializerProto::ISVKey& key_proto) {
   return GurobiISVKey{
-      .name = std::string(key_proto.name()),
-      .application_name = std::string(key_proto.application_name()),
+      .name = google::protobuf::StringCopy(key_proto.name()),
+      .application_name =
+          google::protobuf::StringCopy(key_proto.application_name()),
       .expiration = key_proto.expiration(),
-      .key = std::string(key_proto.key()),
+      .key = google::protobuf::StringCopy(key_proto.key()),
   };
 }
 

ortools/math_opt/elemental/BUILD.bazel

@@ -62,6 +62,7 @@ cc_library(
         ":symmetry",
         ":thread_safe_id_map",
         "//ortools/base:status_macros",
+        "//ortools/base:string_view_migration",
         "//ortools/math_opt:model_cc_proto",
         "//ortools/math_opt:model_update_cc_proto",
         "//ortools/math_opt:sparse_containers_cc_proto",

ortools/math_opt/elemental/elemental_from_proto.cc

@@ -26,6 +26,7 @@
 #include "google/protobuf/repeated_ptr_field.h"
 #include "ortools/base/status_builder.h"
 #include "ortools/base/status_macros.h"
+#include "ortools/base/string_view_migration.h"
 #include "ortools/math_opt/core/model_summary.h"
 #include "ortools/math_opt/elemental/attr_key.h"
 #include "ortools/math_opt/elemental/attributes.h"
@@ -253,8 +254,8 @@ absl::StatusOr<Elemental> ElementalFromModelProtoImpl(const ModelProto& proto) {
     return absl::UnimplementedError(
         "Elemental does not support sos2 constraints yet");
   }
-  Elemental elemental(std::string(proto.name()),
-                      std::string(proto.objective().name()));
+  Elemental elemental(google::protobuf::StringCopy(proto.name()),
+                      google::protobuf::StringCopy(proto.objective().name()));
   AddVariables(proto.variables(), elemental);
   {
     const ObjectiveProto& objective = proto.objective();

ortools/sat/BUILD.bazel

@@ -33,6 +33,7 @@ cc_library(
         ":model",
         ":sat_parameters_cc_proto",
         "//ortools/util:sorted_interval_list",
+        "//ortools/base:string_view_migration",
         "@abseil-cpp//absl/container:flat_hash_map",
         "@abseil-cpp//absl/log:check",
         "@abseil-cpp//absl/strings",

ortools/sat/cp_model.cc

@@ -26,6 +26,7 @@
 #include "absl/strings/str_format.h"
 #include "absl/strings/string_view.h"
 #include "absl/types/span.h"
+#include "ortools/base/string_view_migration.h"
 #include "ortools/sat/cp_model.pb.h"
 #include "ortools/sat/cp_model_utils.h"
 #include "ortools/util/sorted_interval_list.h"
@@ -125,7 +126,8 @@ IntVar IntVar::WithName(absl::string_view name) {
 
 std::string IntVar::Name() const {
   if (builder_ == nullptr) return "null";
-  return std::string(builder_->Proto().variables(index_).name());
+  return google::protobuf::StringCopy(
+      builder_->Proto().variables(index_).name());
 }
 
 ::operations_research::Domain IntVar::Domain() const {
@@ -619,7 +621,8 @@ BoolVar IntervalVar::PresenceBoolVar() const {
 
 std::string IntervalVar::Name() const {
   if (builder_ == nullptr) return "null";
-  return std::string(builder_->Proto().constraints(index_).name());
+  return google::protobuf::StringCopy(
+      builder_->Proto().constraints(index_).name());
 }
 
 std::string IntervalVar::DebugString() const {

ortools/sat/python/BUILD.bazel

@@ -89,6 +89,7 @@ pybind_extension(
         ":linear_expr",
         ":linear_expr_doc",
         ":proto_builder_pybind11",
+        "//ortools/base:string_view_migration",
         "//ortools/sat:cp_model_cc_proto",
         "//ortools/sat:cp_model_utils",
         "//ortools/sat:sat_parameters_cc_proto",

ortools/sat/python/cp_model_helper.cc

@@ -25,6 +25,7 @@
 #include "absl/functional/any_invocable.h"
 #include "absl/strings/escaping.h"
 #include "absl/strings/str_cat.h"
+#include "ortools/base/string_view_migration.h"
 #include "ortools/port/proto_utils.h"  // IWYU: keep
 #include "ortools/sat/cp_model.pb.h"
 #include "ortools/sat/cp_model_utils.h"
@@ -131,7 +132,7 @@ class ResponseWrapper {
   }
 
   std::string SolutionInfo() const {
-    return std::string(response_.solution_info());
+    return google::protobuf::StringCopy(response_.solution_info());
   }
 
   std::vector<int> SufficientAssumptionsForInfeasibility() const {