Add skstd::move and skstd::forward.
Since we can't use the c++11 standard library, re-implement the bits
we want to use now.
TBR=reed@google.com
The next CL is try to move SkTemplates into private.
Review URL: https://codereview.chromium.org/1273813002
diff --git a/include/private/SkTLogic.h b/include/private/SkTLogic.h
index d188242..2710d6d 100644
--- a/include/private/SkTLogic.h
+++ b/include/private/SkTLogic.h
@@ -18,6 +18,8 @@
#ifndef SkTLogic_DEFINED
#define SkTLogic_DEFINED
+#include <stdint.h>
+
/** Represents a templated integer constant.
* Pre-C++11 version of std::integral_constant.
*/
@@ -108,4 +110,29 @@
static const bool value = sizeof(func<T>(NULL)) == sizeof(uint8_t); \
}
+namespace skstd {
+
+/** SkTRemoveReference<T>::type is the type of T with any top-level lvalue or rvalue removed. */
+template <typename T> struct remove_reference { typedef T type; };
+template <typename T> struct remove_reference<T&> { typedef T type; };
+template <typename T> struct remove_reference<T&&> { typedef T type; };
+template <typename T> using remove_reference_t = typename remove_reference<T>::type;
+
+/** SkTIsLValueReference<T>::value is true if the type T is an lvalue reference. */
+template <typename T> struct is_lvalue_reference : SkFalse {};
+template <typename T> struct is_lvalue_reference<T&> : SkTrue {};
+
+} // namespace skstd
+
+/**
+ * SkTIsConst<T>::value is true if the type T is const.
+ * The type T is constrained not to be an array or reference type.
+ */
+template <typename T> struct SkTIsConst {
+ static T* t;
+ static uint16_t test(const volatile void*);
+ static uint32_t test(volatile void *);
+ static const bool value = (sizeof(uint16_t) == sizeof(test(t)));
+};
+
#endif