From e6a9df4ff6a4e3e9ab9fc5dcea4137d6dcf324ab Mon Sep 17 00:00:00 2001
From: Kirk Shoop <kirk.shoop@microsoft.com>
Date: Thu, 7 Feb 2013 01:11:48 -0800
Subject: Get the CPP linq sample compiling on clang 4.1 (OSX)

---
 Ix/CPP/samples/SampleCppLinq/SampleCppLinq.cpp |  8 ++++----
 Ix/CPP/src/cpplinq/linq.hpp                    | 21 +++++++++++++++++----
 Ix/CPP/src/cpplinq/linq_iterators.hpp          |  8 ++++----
 Ix/CPP/src/cpplinq/util.hpp                    | 13 +++++++++++--
 4 files changed, 36 insertions(+), 14 deletions(-)

(limited to 'Ix')

diff --git a/Ix/CPP/samples/SampleCppLinq/SampleCppLinq.cpp b/Ix/CPP/samples/SampleCppLinq/SampleCppLinq.cpp
index e459e4b..3e6483e 100644
--- a/Ix/CPP/samples/SampleCppLinq/SampleCppLinq.cpp
+++ b/Ix/CPP/samples/SampleCppLinq/SampleCppLinq.cpp
@@ -3,8 +3,6 @@
 // SampleCppLinq.cpp : Defines the entry point for the console application.
 //
 
-#include <cpplinq\linq.hpp>
-
 #include <iostream>
 #include <fstream>
 #include <iomanip>
@@ -16,6 +14,8 @@
 #include <algorithm>
 #include <numeric>
 
+#include <cpplinq/linq.hpp>
+
 using namespace std;
 
 vector<string> load_data();
@@ -52,7 +52,7 @@ void run()
     
     for (auto giter = data.begin(), end = data.end(); giter != end; ++giter)
     {
-        auto& g = *giter;
+        const auto& g = *giter;
 
         cout << "arguments: " << g.key << endl;
 
@@ -63,7 +63,7 @@ void run()
 
         for (auto giter = seq.begin(), end = seq.end(); giter != end; ++giter)
         {
-            auto& g = *giter;
+            const auto& g = *giter;
 
             cout << g.key << ", ";
             
diff --git a/Ix/CPP/src/cpplinq/linq.hpp b/Ix/CPP/src/cpplinq/linq.hpp
index 1070331..7a7f6c2 100644
--- a/Ix/CPP/src/cpplinq/linq.hpp
+++ b/Ix/CPP/src/cpplinq/linq.hpp
@@ -149,6 +149,15 @@
 #define LINQ_USE_RTTI 1
 #endif
 
+#if defined(__clang__)
+#if __has_feature(cxx_rvalue_references)
+#define LINQ_USE_RVALUEREF 1
+#endif
+#if __has_feature(cxx_rtti)
+#define LINQ_USE_RTTI 1
+#endif
+#endif
+
 
 // individual features 
 #include "util.hpp"
@@ -242,7 +251,7 @@ public:
 
     template <class Predicate>
     linq_driver< linq_where<Collection, Predicate> > where(Predicate p) const {
-        return typename linq_where<Collection, Predicate>(c, std::move(p) );
+        return linq_where<Collection, Predicate>(c, std::move(p) );
     }
     
 
@@ -266,7 +275,7 @@ public:
         return std::accumulate(begin(), end(), initialValue, fn);
     }
 
-    bool any() const { return !empty(cur); }
+    bool any() const { auto cur = c.get_cursor(); return !cur.empty(); }
 
     template <class Predicate>
     bool any(Predicate p) const {
@@ -282,12 +291,16 @@ public:
 
     // TODO: average
 
+#if !defined(__clang__)
+    // Clang complains that linq_driver is not complete until the closing brace 
+    // so (linq_driver*)->select() cannot be resolved.
     template <class U>
     auto cast() 
     -> decltype(static_cast<linq_driver*>(0)->select(detail::cast_to<U>())) 
     {
         return this->select(detail::cast_to<U>());
     }
+#endif
 
     // TODO: concat
 
@@ -295,12 +308,12 @@ public:
         return std::find(begin(), end(), value) != end();
     }
 
-    typename std::iterator_traits<iterator>::distance_type count() const {
+    typename std::iterator_traits<iterator>::difference_type count() const {
         return std::distance(begin(), end());
     }
 
     template <class Predicate>
-    typename std::iterator_traits<iterator>::distance_type count(Predicate p) const {
+    typename std::iterator_traits<iterator>::difference_type count(Predicate p) const {
         auto filtered = this->where(p);
         return std::distance(begin(filtered), end(filtered));
     }
diff --git a/Ix/CPP/src/cpplinq/linq_iterators.hpp b/Ix/CPP/src/cpplinq/linq_iterators.hpp
index ed267ec..a04b217 100644
--- a/Ix/CPP/src/cpplinq/linq_iterators.hpp
+++ b/Ix/CPP/src/cpplinq/linq_iterators.hpp
@@ -74,16 +74,16 @@ namespace cpplinq {
     namespace util {
         template <class Iter, class T>
         typename std::iterator_traits<Iter>::pointer deref_iterator(const Iter& it) {
-            return detail::deref_iterator(it, std::identity<typename std::iterator_traits<Iter>::reference>());
+            return deref_iterator(it, util::identity<typename std::iterator_traits<Iter>::reference>());
         }
 
         template <class Iter, class T>
-        T* deref_iterator(const Iter& it, std::identity<T&>) {
+        T* deref_iterator(const Iter& it, util::identity<T&>) {
             return &*it;
         }
 
         template <class Iter, class T>
-        util::value_ptr<T> deref_iterator(const Iter& it, std::identity<T>) {
+        util::value_ptr<T> deref_iterator(const Iter& it, util::identity<T>) {
             return util::value_ptr<T>(*it);
         }
     } 
@@ -137,7 +137,7 @@ namespace cpplinq {
             return cur->get();
         }
 
-        pointer operator->() const {
+        typename cursor_iterator::pointer operator->() const {
             auto& v = **this;
             return &v;
         }
diff --git a/Ix/CPP/src/cpplinq/util.hpp b/Ix/CPP/src/cpplinq/util.hpp
index 6fb62ff..f1e5222 100644
--- a/Ix/CPP/src/cpplinq/util.hpp
+++ b/Ix/CPP/src/cpplinq/util.hpp
@@ -104,17 +104,26 @@ namespace cpplinq { namespace util {
                                                 detail::instance<A2>(),
                                                 detail::instance<A3>())) type;
     };
-#else
+#elif defined(_MSC_VER)
     template <class T>
     struct result_of<T> : std::tr1::result_of<T> {};
+#else
+    using std::result_of;
 #endif
 
+    template<class Type>
+    struct identity 
+    {
+        typedef Type type;
+        Type operator()(const Type& left) const {return left;}
+    };
+
     // faux pointer proxy for iterators that dereference to a value rather than reference, such as selectors
     template <class T>
     struct value_ptr
     {
         T value;
-        value_ptr(const T& pvalue) : value(value)
+        value_ptr(const T& value) : value(value)
         {}
         value_ptr(const T* pvalue) : value(*pvalue)
         {}
-- 
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