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@@ -113,12 +113,10 @@ if (itr != my_data.end()) {
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## 21.5 Using STL’s Associative Hash Table (Map)
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## 21.5 Using STL’s Associative Hash Table (Map)
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- Using the default std::string hash function.
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- Using the default std::string hash function.
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- With no specified initial table size. (map a std::string type key to a class Foo type value)
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- With no specified initial table size. (map a std::string type key to a class Foo type value)
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```cpp
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```cpp
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std::unordered_map<std::string,Foo> m;
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std::unordered_map<std::string,Foo> m;
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```
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```
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- Optionally specifying initial (minimum) table size.
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- Optionally specifying initial (minimum) table size.
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```cpp
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```cpp
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std::unordered_map<std::string,Foo> m(1000);
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std::unordered_map<std::string,Foo> m(1000);
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@@ -128,18 +126,15 @@ std::unordered_map<std::string,Foo> m(1000);
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```cpp
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```cpp
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std::unordered_map<std::string,Foo,std::function<unsigned int(std::string)> > m(1000, MyHashFunction);
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std::unordered_map<std::string,Foo,std::function<unsigned int(std::string)> > m(1000, MyHashFunction);
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```
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```
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- Using the decltype specifier to get the “declared type of an entity”.
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- Using the decltype specifier to get the “declared type of an entity”.
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```cpp
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```cpp
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std::unordered_map<std::string,Foo,decltype(&MyHashFunction)> m(1000, MyHashFunction);
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std::unordered_map<std::string,Foo,decltype(&MyHashFunction)> m(1000, MyHashFunction);
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```
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```
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- Using a home-made std::string hash functor or function object.
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- Using a home-made std::string hash functor or function object.
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- With no specified initial table size.
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- With no specified initial table size.
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```cpp
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```cpp
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std::unordered_map<std::string,Foo,MyHashFunctor> m;
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std::unordered_map<std::string,Foo,MyHashFunctor> m;
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```
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```
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- Optionally specifying initial (minimum) table size.
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- Optionally specifying initial (minimum) table size.
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```cpp
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```cpp
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std::unordered_map<std::string,Foo,MyHashFunctor> m(1000);
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std::unordered_map<std::string,Foo,MyHashFunctor> m(1000);
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