Yulong Bai superboy0712

## CMakeLists.txt
# References:
# https://cmake.org/cmake/help/latest/command/add_custom_target.html
# https://samthursfield.wordpress.com/2015/11/21/cmake-dependencies-between-targets-and-files-and-custom-commands/
# https://gist.github.com/socantre/7ee63133a0a3a08f3990
# https://stackoverflow.com/questions/24163778/how-to-add-custom-target-that-depends-on-make-install
# https://stackoverflow.com/questions/30719275/add-custom-command-is-not-generating-a-target
# https://stackoverflow.com/questions/26024235/how-to-call-a-cmake-function-from-add-custom-target-command
# https://blog.csdn.net/gubenpeiyuan/article/details/51096777

cmake_minimum_required(VERSION 3.10)

## effective_modern_cmake.md

      
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                mbinna
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                Effective Modern CMake
              
          
    Effective Modern CMake

Getting Started

For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.
After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft

  
## compile_time_regex.cc
template <typename Left, typename Right>
struct ConcatExpr;

template <typename Left, typename Right>
struct AltExpr;

template <typename SubExpr>
struct RepeatExpr;

template <char ch>

## springer-free-maths-books.md

      
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                Springer made a bunch of books available for free, these were the direct links
              
          
    These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions
A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen
A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

  
## Makefile
# Add the following 'help' target to your Makefile
# And add help text after each target name starting with '\#\#'

help:           ## Show this help.
	@fgrep -h "##" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -e 's/\\$$//' | sed -e 's/##//'

# Everything below is an example

target00:       ## This message will show up when typing 'make help'
	@echo does nothing

## Observer.cpp
#include <memory>
#include <vector>
#include <functional>
#include <unordered_map>
#include <map>
#include <string>
#include <typeindex>
#include <iostream>
#include <cassert>
	# References:
	# https://cmake.org/cmake/help/latest/command/add_custom_target.html
	# https://samthursfield.wordpress.com/2015/11/21/cmake-dependencies-between-targets-and-files-and-custom-commands/
	# https://gist.github.com/socantre/7ee63133a0a3a08f3990
	# https://stackoverflow.com/questions/24163778/how-to-add-custom-target-that-depends-on-make-install
	# https://stackoverflow.com/questions/30719275/add-custom-command-is-not-generating-a-target
	# https://stackoverflow.com/questions/26024235/how-to-call-a-cmake-function-from-add-custom-target-command
	# https://blog.csdn.net/gubenpeiyuan/article/details/51096777

	cmake_minimum_required(VERSION 3.10)
	template <typename Left, typename Right>
	struct ConcatExpr;

	template <typename Left, typename Right>
	struct AltExpr;

	template <typename SubExpr>
	struct RepeatExpr;

	template <char ch>
	# Add the following 'help' target to your Makefile
	# And add help text after each target name starting with '\#\#'

	help: ## Show this help.
	@fgrep -h "##" $(MAKEFILE_LIST) \| fgrep -v fgrep \| sed -e 's/\\$$//' \| sed -e 's/##//'

	# Everything below is an example

	target00: ## This message will show up when typing 'make help'
	@echo does nothing
	#include <memory>
	#include <vector>
	#include <functional>
	#include <unordered_map>
	#include <map>
	#include <string>
	#include <typeindex>
	#include <iostream>
	#include <cassert>