<center>**Compiled by Sheldon, EOS Go Contributor.**</center>

## Table of Contents:
> 1. fc libraries: [scope_exit.hpp](https://github.com/EOSIO/eos/blob/master/libraries/fc/include/fc/scoped_exit.hpp)
> 2. Glossary: scope，code
> 3. per-contract stdout
> 4. fc libraries: [static_variant.hpp](https://github.com/EOSIO/eos/blob/master/libraries/fc/include/fc/static_variant.hpp)
> 5. Region of data 
> 6. Global Table
> 7. Separate computation & bandwidth

# 1. Scoped_exit.hpp in authority_checker.hpp
> [scoped_exit.hpp](https://github.com/EOSIO/eos/blob/master/libraries/fc/include/fc/scoped_exit.hpp)
> [authority_checker.hpp](https://github.com/EOSIO/eos/blob/master/libraries/chain/include/eosio/chain/authority_checker.hpp)
![](https://us.v-cdn.net/6030588/uploads/editor/f5/jb99qeyy5ukw.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/md/583qez7cah0c.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/ap/0mj1vuk76ri0.png "")
# 2. Glossary: scope vs code
![](https://us.v-cdn.net/6030588/uploads/editor/tc/0kzqoldoy9fx.png "")
`N(scope), N(code), N(table), MyModel, uint128_t`
![](https://us.v-cdn.net/6030588/uploads/editor/k9/0ws3ywtj6ch2.png "")
# 3. per-contract stdout
![](https://us.v-cdn.net/6030588/uploads/editor/kz/ql7vyrhko0wb.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/97/0u1vgdj799ko.png "")

# 4. static_variant.hpp in fc libraries
![](https://us.v-cdn.net/6030588/uploads/editor/mv/12y1spditec8.png "")

![](https://us.v-cdn.net/6030588/uploads/editor/5w/fjay4ypdhtn7.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/1h/zsg9x84w3k1c.png "")
> syntactic sugar for operating on the data of a discriminated union based on the type it holds
> C++17 http://en.cppreference.com/w/cpp/utility/variant
![](https://us.v-cdn.net/6030588/uploads/editor/99/3l1zelh6fd9d.png "")

# 5. Region of data
![](https://us.v-cdn.net/6030588/uploads/editor/mx/zapmw9st4nf9.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/yr/aaywwge0tp06.png "")
> Bart: each row of a table is in exactly 1 scope
![](https://us.v-cdn.net/6030588/uploads/editor/ye/81kcjzb0w6a1.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/ix/jz5czgx815sy.png "")
> By default region 0 implies the current chain and all other chains have different region codes.  --Dan
![](https://us.v-cdn.net/6030588/uploads/editor/fq/tq4r8r8jta7b.png "")
> reference: [Nov 2017 Update Apple Enclave & IBC ](https://steemit.com/eos/@dan/eos-io-developer-update-support-for-apple-s-secure-enclave-and-similar-technologies)

# 6. Global Table
![](https://us.v-cdn.net/6030588/uploads/editor/te/ijcpdstuo2xu.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/1s/ri2nzftn8467.png "")


# 7. Separate computation & bandwidth intensive, expand horizontally & vertically
![](https://us.v-cdn.net/6030588/uploads/editor/9u/ceyixz55ujva.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/18/psyky4kh8q6e.png "")
![](https://us.v-cdn.net/6030588/uploads/editor/2j/oq1kowm96x38.png "")

<br>
## Go EOS!

---------------------------------------

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