code style fix, test=develop (#15045)

* code style fix, test=develop

paddle/fluid/framework/attribute.h

@@ -165,7 +165,7 @@ template <typename T>
 class GreaterThanChecker {
  public:
   explicit GreaterThanChecker(T lower_bound) : lower_bound_(lower_bound) {}
-  void operator()(T& value) const {
+  void operator()(const T& value) const {
     PADDLE_ENFORCE(value > lower_bound_, "larger_than check fails.");
   }
 
@@ -177,7 +177,7 @@ template <typename T>
 class EqualGreaterThanChecker {
  public:
   explicit EqualGreaterThanChecker(T lower_bound) : lower_bound_(lower_bound) {}
-  void operator()(T& value) const {
+  void operator()(const T& value) const {
     PADDLE_ENFORCE_GE(value, lower_bound_, "equal_larger_than check fails.");
   }
 
@@ -193,7 +193,7 @@ class DefaultValueSetter {
  public:
   explicit DefaultValueSetter(T default_value)
       : default_value_(default_value) {}
-  void operator()(T& value) const { value = default_value_; }  // NOLINT
+  void operator()(T* value) const { *value = default_value_; }
 
  private:
   T default_value_;
@@ -203,7 +203,7 @@ template <typename T>
 class EnumInContainer {
  public:
   explicit EnumInContainer(const std::unordered_set<T>& c) : container_(c) {}
-  void operator()(T& val) const {
+  void operator()(const T& val) const {
     PADDLE_ENFORCE(container_.find(val) != container_.end(),
                    "Value %s is not in enum container %s", val,
                    ContainerDebugString());
@@ -232,7 +232,8 @@ class EnumInContainer {
 // an attribute can have more than one limits
 template <typename T>
 class TypedAttrChecker {
-  typedef std::function<void(T&)> ValueChecker;
+  typedef std::function<void(T*)> DefaultValueChecker;
+  typedef std::function<void(const T&)> ValueChecker;
 
  public:
   explicit TypedAttrChecker(const std::string& attr_name)
@@ -268,17 +269,17 @@ class TypedAttrChecker {
     return *this;
   }
 
-  void operator()(AttributeMap& attr_map) const {  // NOLINT
-    if (!attr_map.count(attr_name_)) {
+  void operator()(AttributeMap* attr_map) const {
+    if (!attr_map->count(attr_name_)) {
       // user do not set this attr
       PADDLE_ENFORCE(!default_value_setter_.empty(),
                      "Attribute '%s' is required!", attr_name_);
       // default_value_setter_ has no more than one element
       T val;
-      (default_value_setter_[0])(val);
-      attr_map[attr_name_] = val;
+      (default_value_setter_[0])(&val);
+      (*attr_map)[attr_name_] = val;
     }
-    Attribute& attr = attr_map.at(attr_name_);
+    Attribute& attr = attr_map->at(attr_name_);
     ExtractAttribute<T> extract_attr(attr_name_);
     T* attr_value = extract_attr(attr);
     for (const auto& checker : value_checkers_) {
@@ -289,12 +290,12 @@ class TypedAttrChecker {
  private:
   std::string attr_name_;
   std::vector<ValueChecker> value_checkers_;
-  std::vector<ValueChecker> default_value_setter_;
+  std::vector<DefaultValueChecker> default_value_setter_;
 };
 
 // check whether op's all attributes fit their own limits
 class OpAttrChecker {
-  typedef std::function<void(AttributeMap&)> AttrChecker;
+  typedef std::function<void(AttributeMap*)> AttrChecker;
 
  public:
   template <typename T>
@@ -304,7 +305,7 @@ class OpAttrChecker {
     return *(checker.target<TypedAttrChecker<T>>());
   }
 
-  void Check(AttributeMap& attr_map) const {  // NOLINT
+  void Check(AttributeMap* attr_map) const {
     for (const auto& checker : attr_checkers_) {
       checker(attr_map);
     }

paddle/fluid/framework/op_desc.cc

@@ -643,7 +643,7 @@ void OpDesc::CheckAttrs() {
     // not by users.
     return;
   }
-  checker->Check(attrs_);
+  checker->Check(&attrs_);
 }
 
 void OpDesc::InferShape(const BlockDesc &block) const {

paddle/fluid/framework/op_registry.cc

@@ -24,7 +24,7 @@ std::unique_ptr<OperatorBase> OpRegistry::CreateOp(
     const VariableNameMap& outputs, AttributeMap attrs) {
   auto& info = OpInfoMap::Instance().Get(type);
   if (info.Checker() != nullptr) {
-    info.Checker()->Check(attrs);
+    info.Checker()->Check(&attrs);
   }
   auto op = info.Creator()(type, inputs, outputs, attrs);
   return std::unique_ptr<OperatorBase>(op);

paddle/fluid/operators/sequence_ops/sequence_mask_op.h

@@ -52,7 +52,7 @@ class SequenceMaskOpMaker : public framework::OpProtoAndCheckerMaker {
                  "The maximum length of the sequence. If maxlen < 0, maxlen "
                  "= max(Input(X)).")
         .SetDefault(-1)
-        .AddCustomChecker([](int &v) {
+        .AddCustomChecker([](const int &v) {
           PADDLE_ENFORCE(v < 0 || v >= 1,
                          "Attr(maxlen) must be less than 0 or larger than 1");
         });