From fd79951348d6b51ce172799bb158da4193301a94 Mon Sep 17 00:00:00 2001
From: haozech <chenhaoze94@gmail.com>
Date: Wed, 17 Jun 2020 11:14:15 +0000
Subject: [PATCH] reconstrcut infershape

---
 lite/core/tensor.h | 119 ++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 113 insertions(+), 6 deletions(-)

diff --git a/lite/core/tensor.h b/lite/core/tensor.h
index 2209e524f4..0fdd72458d 100644
--- a/lite/core/tensor.h
+++ b/lite/core/tensor.h
@@ -38,28 +38,123 @@ class TensorLite;
 using DDim = lite::DDimLite;
 using Tensor = lite::TensorLite;
 
+template <typename ValueType, size_t initLength>
+class SmallVector {
+ public:
+  SmallVector() {
+    // VLOG(3)<<"call constructor";
+    data_ = new ValueType[initLength]();
+    //    data_ = static_cast<ValueType *>(malloc(DimLength *
+    //    sizeof(ValueType)));
+    //    data_.resize(DimLength);
+    //    memset(data_, 0, DimLength * sizeof(ValueType));
+    size_ = 0U;
+    memory_size = initLength;
+  }
+
+  ~SmallVector() {
+    // VLOG(3)<<"call deconstructor";
+    if (data_ != nullptr) {
+      delete[] data_;
+      //    free(data_);
+    }
+    data_ = nullptr;
+    size_ = 0U;
+    memory_size = 0U;
+  }
+
+  size_t size() const {
+    // VLOG(3)<<"call size()";
+    return size_;
+  }
+  void resize(size_t new_size) {
+    // VLOG(3)<<"call resize()";
+    if (new_size > memory_size) {
+      if (data_ != nullptr) {
+        delete[] data_;
+      }
+      data_ = new ValueType[new_size]();
+      memory_size = new_size;
+    }
+    size_ = new_size;
+  }
+
+  ValueType *mutable_data() { return data_; }
+  const ValueType *data() const {
+    // VLOG(3)<<"call data()";
+    return data_;
+  }
+
+  ValueType operator[](int offset) const {
+    // VLOG(3)<<"call operator[]";
+    return data_[offset];
+  }
+  ValueType &operator[](int offset) {
+    // VLOG(3)<<"call &operator[]";
+    return data_[offset];
+  }
+
+ private:
+  //  ValueType data_[DimLength];
+  //  ValueType* data_{nullptr};
+  ValueType *data_{nullptr};
+  size_t size_{0U};
+  size_t memory_size{0U};
+};
+
 class DDimLite {
  public:
+  constexpr static size_t init_length = 4;
   using value_type = int64_t;
+  using DDimVector = SmallVector<value_type, init_length>;
 
   DDimLite() = default;
+  DDimLite(const DDimLite &a) {
+    data_.resize(a.size());
+    if (a.size() > 0U) {
+      memcpy(
+          data_.mutable_data(), a.data().data(), a.size() * sizeof(value_type));
+    }  // deep copy
+  }
 
   explicit DDimLite(const std::vector<value_type> &x) { ConstructFrom(x); }
   // DDimLite(std::initializer_list<value_type> init_list) :
   // DDimLite(std::vector<value_type>(init_list)) {}
 
-  void ConstructFrom(const std::vector<value_type> &x) { data_ = x; }
-
+  void ConstructFrom(const std::vector<value_type> &x) {
+    data_.resize(x.size());
+    if (x.size() > 0U) {
+      memcpy(data_.mutable_data(), x.data(), x.size() * sizeof(value_type));
+      // std::copy(x.data(), x.data() + x.size(), data_.mutable_data());
+    }
+  }
   value_type operator[](int offset) const { return data_[offset]; }
   value_type &operator[](int offset) { return data_[offset]; }
-  std::vector<int64_t> Vectorize() const { return data_; }
+  std::vector<value_type> Vectorize() const {
+    std::vector<value_type> vec;
+    vec.resize(data_.size());
+    if (data_.size() > 0U) {
+      memcpy(vec.data(), data_.data(), data_.size() * sizeof(value_type));
+      // std::copy(data_.data(), data_.data() + data_.size(), vec.data());
+    }
+    return vec;
+  }
 
   size_t size() const { return data_.size(); }
-  bool empty() const { return data_.empty(); }
+  void resize(size_t size) { data_.resize(size); }
+  bool empty() const { return data_.size() == 0U; }
 
   value_type production() const;
 
-  const std::vector<value_type> &data() const { return data_; }
+  const std::vector<value_type> data() const {
+    std::vector<value_type> vec;
+    vec.resize(data_.size());
+    if (data_.size() > 0U) {
+      memcpy(vec.data(), data_.data(), data_.size() * sizeof(value_type));
+      // std::copy(data_.data(), data_.data() + data_.size(), vec.data());
+    }
+    return vec;
+  }
   value_type count(int start, int end) const;
 
   DDimLite Slice(int start, int end) const;
@@ -76,6 +171,18 @@ class DDimLite {
     return os;
   }
 
+  DDimLite &operator=(const DDimLite &a) {
+    this->data_.resize(a.size());
+    if (a.size() > 0U) {
+      // std::copy(a.data().data(), a.data().data() + a.data().size(),
+      // this->data_.mutable_data());
+      memcpy(this->data_.mutable_data(),
+             a.data().data(),
+             a.size() * sizeof(value_type));
+    }
+    return *this;
+  }
+
   friend bool operator==(const DDimLite &a, const DDimLite &b) {
     if (a.size() != b.size()) return false;
     for (size_t i = 0; i < a.size(); i++) {
@@ -93,7 +200,7 @@ class DDimLite {
   }
 
  private:
-  std::vector<value_type> data_;
+  DDimVector data_;
 };
 
 using LoD = std::vector<std::vector<uint64_t>>;
-- 
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