add FixedArray

include/mcl/array.hpp

@@ -10,6 +10,7 @@
 #include <stddef.h>
 
 namespace mcl {
+
 template<class T>
 class Array {
 	T *p_;
@@ -80,5 +81,48 @@ public:
 	T* data() { return p_; }
 	const T* data() const { return p_; }
 };
+
+template<class T, size_t maxSize>
+class FixedArray {
+	T p_[maxSize];
+	size_t n_;
+	FixedArray(const FixedArray&);
+	void operator=(const FixedArray&);
+	template<class U>
+	void swap_(U& x, U& y) const
+	{
+		U t;
+		t = x;
+		x = y;
+		y = t;
+	}
+public:
+	FixedArray() : n_(0) {}
+	bool resize(size_t n)
+	{
+		if (n > maxSize) return false;
+		n_ = n;
+		return true;
+	}
+	bool copy(const FixedArray<T, maxSize>& rhs)
+	{
+		if (this == &rhs) return true;
+		for (size_t i = 0; i < rhs.n_; i++) {
+			p_[i] = rhs.p_[i];
+		}
+		n_ = rhs.n_;
+		return true;
+	}
+	void clear()
+	{
+		n_ = 0;
+	}
+	size_t size() const { return n_; }
+	T& operator[](size_t n) { return p_[n]; }
+	const T& operator[](size_t n) const { return p_[n]; }
+	T* data() { return p_; }
+	const T* data() const { return p_; }
+};
+
 } // mcl
 

test/array_test.cpp

@@ -30,3 +30,31 @@ CYBOZU_TEST_AUTO(resize)
 	CYBOZU_TEST_EQUAL(b.size(), large);
 	CYBOZU_TEST_EQUAL_ARRAY(a.data(), b.data(), small);
 }
+
+CYBOZU_TEST_AUTO(FixedArray)
+{
+	const size_t n = 5;
+	mcl::FixedArray<int, n> a, b;
+	CYBOZU_TEST_EQUAL(a.size(), 0);
+	CYBOZU_TEST_EQUAL(b.size(), 0);
+
+	bool ok = a.resize(n);
+	CYBOZU_TEST_ASSERT(ok);
+	CYBOZU_TEST_EQUAL(n, a.size());
+	for (size_t i = 0; i < n; i++) {
+		a[i] = i;
+	}
+	ok = b.copy(a);
+	CYBOZU_TEST_ASSERT(ok);
+	CYBOZU_TEST_EQUAL(b.size(), n);
+	CYBOZU_TEST_EQUAL_ARRAY(a.data(), b.data(), n);
+
+	const size_t small = n - 1;
+	ok = b.resize(small);
+	CYBOZU_TEST_ASSERT(ok);
+	CYBOZU_TEST_EQUAL(b.size(), small);
+	CYBOZU_TEST_EQUAL_ARRAY(a.data(), b.data(), small);
+	const size_t large = n + 1;
+	ok = b.resize(large);
+	CYBOZU_TEST_ASSERT(!ok);
+}