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This commit is contained in:
Jidong Xiao
2023-11-09 16:33:18 -05:00
parent 4a2ce5242f
commit 6df56ced38

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