BOSCORE/BOS 2.0.2 fixes and EOSIO 1.6.0 & Takeaways

This article didnot cover all changes, only insofar the necessary changes that looks imperative for me.

1. New Standard PR in eosio
2. disable max-implicit
3. llvm directory in MacOS
4. Python-dev in C++
5. assert size_t in wasm_interface.cpp
6. boost homebrew mac
7. Types in C++ 
8. LiteralType & trivial destructor

1. new standard PR:

Example PR: https://github.com/EOSIO/eos/pull/6759

Change Desc
Consensus
API 
Documentation 

2. max-implicit-request is disabled, it used to specific

https://github.com/EOSIO/eos/commit/2edbf2fb84fe66e052d3ae56806ea3bbaf49a315

max sizes of transaction that are sent without first sending a notice

3. llvm macOS

relocated llvm to the correct directory in Apple MacOS Under local/opt/usr/local/opt/llvm@/lib/cmake/llvm Enable auto update by gathering brew files

4. Python-dev in C++

python-dev is the package that contains the header files for the Python C/C++ API,

5. Limit assert size_t = 1024

set in libraries/chain/wasm_interface

constexpr: evaluated the val of variable or function at compiled time

LiteralType

6. Boost brew install

https://github.com/EOSIO/eos/pull/6721/files#diff-597acdcec1b4a1c5cc179fbd43de3e24

7. Types Categories

pointer, member pointer【object, function】, enum, arith【intergral, float】, std::nullptr_t

https://stackoverflow.com/questions/14821936/what-is-a-scalar-object-in-c

reference

pointer, member pointer, enum

Continus: lvalue, rvalue

8. LiteralType

scalar, references, classes, arrays of three before

classes:

Criteria I

• trivial destructor
• The destructor is not user-provided (meaning, it is either implicitly declared, or explicitly defined as defaulted on its first declaration)
• The destructor is not virtual (that is, the base class destructor is not virtual)
• All direct base classes have trivial destructors
• All non-static members of class type have trivial destructors

Criteria II

• aggregate type
• at least one constexpr (possibly template) constructor that is not a copy or move

Aggregate Type

aggregate initialization - cppreference.com

• no private/protected non-static data member
• no virtual member function