COMPMID-417: Extract common toolchain support file

The support file is needed as Android toolchains are missing some C++11
functions. It further includes functions that have been introduced in
C++14 but which we already need.

Eventually the support file might become unnecessary if the Android
compilers improve and we switch to C++14.

Change-Id: Ib5ec506f1a17c78149c315ab2096b901b852c180
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/79247
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Pablo Tello <pablo.tello@arm.com>

1 files changed, 310 insertions, 0 deletions

diff --git a/support/ToolchainSupport.h b/support/ToolchainSupport.h
new file mode 100644
index 0000000000..36b08affb9
--- /dev/null
+++ b/support/ToolchainSupport.h
@@ -0,0 +1,310 @@
+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef ARM_COMPUTE_TEST_TOOLCHAINSUPPORT
+#define ARM_COMPUTE_TEST_TOOLCHAINSUPPORT
+
+#include <algorithm>
+#include <cmath>
+#include <cstddef>
+#include <limits>
+#include <memory>
+#include <numeric>
+#include <sstream>
+#include <string>
+#include <type_traits>
+
+namespace arm_compute
+{
+namespace support
+{
+namespace cpp11
+{
+#ifdef __ANDROID__
+/** Convert integer and float values to string.
+ *
+ * @note This function implements the same behaviour as std::to_string. The
+ *       latter is missing in some Android toolchains.
+ *
+ * @param[in] value Value to be converted to string.
+ *
+ * @return String representation of @p value.
+ */
+template <typename T, typename std::enable_if<std::is_arithmetic<typename std::decay<T>::type>::value, int>::type = 0>
+std::string to_string(T && value)
+{
+    std::stringstream stream;
+    stream << std::forward<T>(value);
+    return stream.str();
+}
+
+/** Convert string values to integer.
+ *
+ * @note This function implements the same behaviour as std::stoi. The latter
+ *       is missing in some Android toolchains.
+ *
+ * @param[in] str String to be converted to int.
+ *
+ * @return Integer representation of @p str.
+ */
+inline int stoi(const std::string &str)
+{
+    std::stringstream stream(str);
+    int               value = 0;
+    stream >> value;
+    return value;
+}
+
+/** Convert string values to unsigned long.
+ *
+ * @note This function implements the same behaviour as std::stoul. The latter
+ *       is missing in some Android toolchains.
+ *
+ * @param[in] str String to be converted to unsigned long.
+ *
+ * @return Unsigned long representation of @p str.
+ */
+inline unsigned long stoul(const std::string &str)
+{
+    std::stringstream stream(str);
+    unsigned long     value = 0;
+    stream >> value;
+    return value;
+}
+
+/** Convert string values to float.
+ *
+ * @note This function implements the same behaviour as std::stof. The latter
+ *       is missing in some Android toolchains.
+ *
+ * @param[in] str String to be converted to float.
+ *
+ * @return Float representation of @p str.
+ */
+inline float stof(const std::string &str)
+{
+    std::stringstream stream(str);
+    float             value = 0.f;
+    stream >> value;
+    return value;
+}
+
+/** Round floating-point value with half value rounding away from zero.
+ *
+ * @note This function implements the same behaviour as std::round except that it doesn't
+ *       support Integral type. The latter is not in the namespace std in some Android toolchains.
+ *
+ * @param[in] value floating-point value to be rounded.
+ *
+ * @return Floating-point value of rounded @p value.
+ */
+template <typename T, typename = typename std::enable_if<std::is_floating_point<T>::value>::type>
+inline T round(T value)
+{
+    return ::round(value);
+}
+
+/** Truncate floating-point value.
+ *
+ * @note This function implements the same behaviour as std::truncate except that it doesn't
+ *       support Integral type. The latter is not in the namespace std in some Android toolchains.
+ *
+ * @param[in] value floating-point value to be truncated.
+ *
+ * @return Floating-point value of truncated @p value.
+ */
+template <typename T, typename = typename std::enable_if<std::is_floating_point<T>::value>::type>
+inline T trunc(T value)
+{
+    return ::trunc(value);
+}
+
+/** Composes a floating point value with the magnitude of @p x and the sign of @p y.
+ *
+ * @note This function implements the same behaviour as std::copysign except that it doesn't
+ *       support Integral type. The latter is not in the namespace std in some Android toolchains.
+ *
+ * @param[in] x value that contains the magnitued to be used in constructing the result.
+ * @param[in] y value that contains the sign to be used in constructin the result.
+ *
+ * @return Floating-point value with magnitude of @p x and sign of @p y.
+ */
+template <typename T, typename = typename std::enable_if<std::is_floating_point<T>::value>::type>
+inline T copysign(T x, T y)
+{
+    return ::copysign(x, y);
+}
+#else
+/** Convert integer and float values to string.
+ *
+ * @note This function acts as a convenience wrapper around std::to_string. The
+ *       latter is missing in some Android toolchains.
+ *
+ * @param[in] value Value to be converted to string.
+ *
+ * @return String representation of @p value.
+ */
+template <typename T>
+std::string to_string(T &&value)
+{
+    return ::std::to_string(std::forward<T>(value));
+}
+
+/** Convert string values to integer.
+ *
+ * @note This function acts as a convenience wrapper around std::stoi. The
+ *       latter is missing in some Android toolchains.
+ *
+ * @param[in] args Arguments forwarded to std::stoi.
+ *
+ * @return Integer representation of input string.
+ */
+template <typename... Ts>
+int stoi(Ts &&... args)
+{
+    return ::std::stoi(std::forward<Ts>(args)...);
+}
+
+/** Convert string values to unsigned long.
+ *
+ * @note This function acts as a convenience wrapper around std::stoul. The
+ *       latter is missing in some Android toolchains.
+ *
+ * @param[in] args Arguments forwarded to std::stoul.
+ *
+ * @return Unsigned long representation of input string.
+ */
+template <typename... Ts>
+int stoul(Ts &&... args)
+{
+    return ::std::stoul(std::forward<Ts>(args)...);
+}
+
+/** Convert string values to float.
+ *
+ * @note This function acts as a convenience wrapper around std::stof. The
+ *       latter is missing in some Android toolchains.
+ *
+ * @param[in] args Arguments forwarded to std::stof.
+ *
+ * @return Float representation of input string.
+ */
+template <typename... Ts>
+int stof(Ts &&... args)
+{
+    return ::std::stof(std::forward<Ts>(args)...);
+}
+
+/** Round floating-point value with half value rounding away from zero.
+ *
+ * @note This function implements the same behaviour as std::round except that it doesn't
+ *       support Integral type. The latter is not in the namespace std in some Android toolchains.
+ *
+ * @param[in] value floating-point value to be rounded.
+ *
+ * @return Floating-point value of rounded @p value.
+ */
+template <typename T, typename = typename std::enable_if<std::is_floating_point<T>::value>::type>
+inline T round(T value)
+{
+    return std::round(value);
+}
+
+/** Truncate floating-point value.
+ *
+ * @note This function implements the same behaviour as std::truncate except that it doesn't
+ *       support Integral type. The latter is not in the namespace std in some Android toolchains.
+ *
+ * @param[in] value floating-point value to be truncated.
+ *
+ * @return Floating-point value of truncated @p value.
+ */
+template <typename T, typename = typename std::enable_if<std::is_floating_point<T>::value>::type>
+inline T trunc(T value)
+{
+    return std::trunc(value);
+}
+
+/** Composes a floating point value with the magnitude of @p x and the sign of @p y.
+ *
+ * @note This function implements the same behaviour as std::copysign except that it doesn't
+ *       support Integral type. The latter is not in the namespace std in some Android toolchains.
+ *
+ * @param[in] x value that contains the magnitued to be used in constructing the result.
+ * @param[in] y value that contains the sign to be used in constructin the result.
+ *
+ * @return Floating-point value with magnitude of @p x and sign of @p y.
+ */
+template <typename T, typename = typename std::enable_if<std::is_floating_point<T>::value>::type>
+inline T copysign(T x, T y)
+{
+    return std::copysign(x, y);
+}
+#endif
+} // namespace cpp11
+
+namespace cpp14
+{
+/** make_unqiue is missing in CPP11. Reimplement it according to the standard
+ * proposal.
+ */
+template <class T>
+struct _Unique_if
+{
+    typedef std::unique_ptr<T> _Single_object;
+};
+
+template <class T>
+struct _Unique_if<T[]>
+{
+    typedef std::unique_ptr<T[]> _Unknown_bound;
+};
+
+template <class T, size_t N>
+struct _Unique_if<T[N]>
+{
+    typedef void _Known_bound;
+};
+
+template <class T, class... Args>
+typename _Unique_if<T>::_Single_object
+make_unique(Args &&... args)
+{
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+
+template <class T>
+typename _Unique_if<T>::_Unknown_bound
+make_unique(size_t n)
+{
+    typedef typename std::remove_extent<T>::type U;
+    return std::unique_ptr<T>(new U[n]());
+}
+
+template <class T, class... Args>
+typename _Unique_if<T>::_Known_bound
+make_unique(Args &&...) = delete;
+} // namespace cpp14
+} // namespace support
+} // namespace arm_compute
+#endif