Add FastVector constructor with begin/end iterators

src/common/FastVector.h

@@ -41,6 +41,9 @@ class FastVector final
     FastVector(FastVector<T, N, Storage> &&other);
     FastVector(std::initializer_list<value_type> init);
 
+    template <class InputIt, std::enable_if_t<!std::is_integral<InputIt>::value, bool> = true>
+    FastVector(InputIt first, InputIt last);
+
     FastVector<T, N, Storage> &operator=(const FastVector<T, N, Storage> &other);
     FastVector<T, N, Storage> &operator=(FastVector<T, N, Storage> &&other);
     FastVector<T, N, Storage> &operator=(std::initializer_list<value_type> init);
@@ -139,11 +142,8 @@ FastVector<T, N, Storage>::FastVector(size_type count)
 
 template <class T, size_t N, class Storage>
 FastVector<T, N, Storage>::FastVector(const FastVector<T, N, Storage> &other)
-{
-    ensure_capacity(other.mSize);
-    mSize = other.mSize;
-    std::copy(other.begin(), other.end(), begin());
-}
+    : FastVector(other.begin(), other.end())
+{}
 
 template <class T, size_t N, class Storage>
 FastVector<T, N, Storage>::FastVector(FastVector<T, N, Storage> &&other) : FastVector()
@@ -158,6 +158,15 @@ FastVector<T, N, Storage>::FastVector(std::initializer_list<value_type> init)
 }
 
 template <class T, size_t N, class Storage>
+template <class InputIt, std::enable_if_t<!std::is_integral<InputIt>::value, bool>>
+FastVector<T, N, Storage>::FastVector(InputIt first, InputIt last)
+{
+    mSize = last - first;
+    ensure_capacity(mSize);
+    std::copy(first, last, begin());
+}
+
+template <class T, size_t N, class Storage>
 FastVector<T, N, Storage> &FastVector<T, N, Storage>::operator=(
     const FastVector<T, N, Storage> &other)
 {

src/common/FastVector_unittest.cpp

@@ -32,6 +32,12 @@ TEST(FastVector, Constructors)
     FastVector<int, 5> copyRValue(std::move(count));
     EXPECT_EQ(3u, copyRValue.size());
 
+    FastVector<int, 5> copyIter(countAndValue.begin(), countAndValue.end());
+    EXPECT_EQ(copyIter, countAndValue);
+
+    FastVector<int, 5> copyIterEmpty(countAndValue.begin(), countAndValue.begin());
+    EXPECT_TRUE(copyIterEmpty.empty());
+
     FastVector<int, 5> initializerList{1, 2, 3, 4, 5};
     EXPECT_EQ(5u, initializerList.size());
     EXPECT_EQ(3, initializerList[2]);