Partial implementation of the std::limits header file.

Only float and double support (partial implementation).

4 files changed, 206 insertions, 0 deletions

diff --git a/include/limits b/include/limits
new file mode 100644
index 0000000..74ef1e0
--- /dev/null
+++ b/include/limits
@@ -0,0 +1,119 @@
+/* -*- c++ -*- */
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef ANDROID_ASTL_LIMITS__
+#define ANDROID_ASTL_LIMITS__
+
+// GNU C++ compiler?
+#ifndef __GNUG__
+#error "__GNUG__ is not defined"
+#endif
+
+#ifdef _T
+#error "_T is defined"
+#endif
+
+// This is very incomplete partial implementation of the standard
+// <limits>. Only partial support for float and double is provided.
+
+namespace std {
+
+struct __numeric_limits_base
+{
+    // True for all fundamental types.
+    static const bool is_specialized = false;
+
+    // True if the type is signed.
+    static const bool is_signed = false;
+
+    // True if the type is integer.
+    static const bool is_integer = false;
+
+    // The number of radix digits that be represented without change. For
+    // integer types, the number of non-sign bits in the representation; for
+    // floating-point types, the number of radix digits in the mantissa.
+    // Equivalent to FLT_MANT_DIG, DBL_MANT_DIG.
+    static const int digits = 0;
+
+    // The number of base 10 digits that can be represented without change.
+    // Equivalent to FLT_DIG, DBL_DIG, LDBL_MANT_DIG.
+    static const int digits10 = 0;
+};
+
+
+// Properties of fundamental types.
+// Only a subset of the properties is supported.
+template<typename _T>
+struct numeric_limits : public __numeric_limits_base
+{
+    // The minimum finite value.
+    static _T min() { return static_cast<_T>(0); }
+
+    // The maximum finite value.
+    static _T max() { return static_cast<_T>(0); }
+};
+
+// Specializations for some fundamental types.
+
+// numeric_limits<float>
+template<>
+struct numeric_limits<float>
+{
+    static const bool is_specialized = true;
+
+    static float min() { return __FLT_MIN__; }
+    static float max() { return __FLT_MAX__; }
+
+    static const bool is_signed = true;
+    static const bool is_integer = false;
+
+    static const int digits = __FLT_MANT_DIG__;
+    static const int digits10 = __FLT_DIG__;
+};
+
+// numeric_limits<double>
+template<>
+struct numeric_limits<double>
+{
+    static const bool is_specialized = true;
+
+    static double min() { return __DBL_MIN__; }
+    static double max() { return __DBL_MAX__; }
+
+    static const bool is_signed = true;
+    static const bool is_integer = false;
+
+    static const int digits = __DBL_MANT_DIG__;
+    static const int digits10 = __DBL_DIG__;
+};
+
+}  // namespace std
+
+
+#endif
diff --git a/tests/Android.mk b/tests/Android.mk
index 825d1eb..b83aa0a 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -63,6 +63,7 @@ endef
 sources := \
     test_algorithm.cpp \
     test_functional.cpp \
+    test_limits.cpp \
     test_string.cpp \
     test_type_traits.cpp \
     test_uninitialized.cpp \
diff --git a/tests/common.h b/tests/common.h
index 1942018..514783c 100644
--- a/tests/common.h
+++ b/tests/common.h
@@ -44,6 +44,9 @@ const int kFailed = 1;
         return false;                                       \
     }
 
+#define EXPECT_FALSE(expr) EXPECT_TRUE(!(expr))
+
+
 #ifndef ARRAYSIZE
 #define ARRAYSIZE(array) (sizeof(array)/sizeof(array[0]))
 #endif
diff --git a/tests/test_limits.cpp b/tests/test_limits.cpp
new file mode 100644
index 0000000..ed77072
--- /dev/null
+++ b/tests/test_limits.cpp
@@ -0,0 +1,83 @@
+/* -*- c++ -*- */
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "../include/limits"
+#ifndef ANDROID_ASTL_LIMITS__
+#error "Wrong header included!!"
+#endif
+#include "common.h"
+
+namespace android {
+
+bool testSpecialized()
+{
+    EXPECT_TRUE(std::numeric_limits<float>::is_specialized);
+    EXPECT_TRUE(std::numeric_limits<double>::is_specialized);
+    return true;
+}
+
+bool testMin()
+{
+    EXPECT_TRUE(std::numeric_limits<float>::min() == __FLT_MIN__);
+    EXPECT_TRUE(std::numeric_limits<double>::min() == __DBL_MIN__);
+    return true;
+}
+
+bool testMax()
+{
+    EXPECT_TRUE(std::numeric_limits<float>::max() == __FLT_MAX__);
+    EXPECT_TRUE(std::numeric_limits<double>::max() == __DBL_MAX__);
+    return true;
+}
+
+bool testSigned()
+{
+    EXPECT_TRUE(std::numeric_limits<float>::is_signed);
+    EXPECT_TRUE(std::numeric_limits<double>::is_signed);
+    return true;
+}
+
+bool testIsInteger()
+{
+    EXPECT_FALSE(std::numeric_limits<float>::is_integer);
+    EXPECT_FALSE(std::numeric_limits<double>::is_integer);
+    return true;
+}
+
+}  // namespace android
+
+int main(int argc, char **argv)
+{
+    FAIL_UNLESS(testSpecialized);
+    FAIL_UNLESS(testMin);
+    FAIL_UNLESS(testMax);
+    FAIL_UNLESS(testSigned);
+    FAIL_UNLESS(testIsInteger);
+    return kPassed;
+}