Fix example to reflect new usage of lazy_emplace_l - issue #143

CMakeLists.txt

@@ -138,6 +138,9 @@ if (PHMAP_BUILD_EXAMPLES)
     add_executable(ex_basic examples/basic.cc phmap.natvis)
     add_executable(ex_bench examples/bench.cc phmap.natvis)
     add_executable(ex_emplace examples/emplace.cc phmap.natvis)
+    if (MSVC)
+        add_executable(ex_lazy_emplace_l examples/lazy_emplace_l.cc phmap.natvis)
+    endif()
     add_executable(ex_serialize examples/serialize.cc phmap.natvis)
     target_include_directories(ex_serialize PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../cereal/include>)
     add_executable(ex_hash_std examples/hash_std.cc phmap.natvis)

examples/lazy_emplace_l.cc

@@ -30,7 +30,7 @@ public:
     {
         int newIndex = -1;
         m_stringsMap.lazy_emplace_l(std::move(str),
-                                    [&](int& v) { newIndex = v; },    // called only when key was already present
+                                    [&](Map::value_type& p) { newIndex = p.second; },  // called only when key was already present
                                     [&](const Map::constructor& ctor) // construct value_type in place when key not present
                                         { newIndex = InterlockedIncrement(curIdx); ctor(std::move(str), newIndex); }); 
 

parallel_hashmap/phmap.h

@@ -3276,10 +3276,10 @@ public:
         return false;
     }
 
-    // if map does not contains key, it is inserted and the mapped value is value-constructed 
-    // with the provided arguments (if any), as with try_emplace. 
-    // if map already  contains key, then the lambda is called with the mapped value (under 
+    // if map already  contains key, the first lambda is called with the mapped value (under 
     // write lock protection) and can update the mapped value.
+    // if map does not contains key, the second lambda is called and it should invoke the 
+    // passed constructor to construct the value
     // returns true if key was not already present, false otherwise.
     // ---------------------------------------------------------------------------------------
     template <class K = key_type, class FExists, class FEmplace>