Build and Install Boost

Get boost library:

https://www.boost.org

Build boost

bootstrap on windows:

.\bootstrap.bat

bootstrap on other os:

./bootstrap.sh

Build

./b2 --help
./b2 -q -j2

Install

./b2 install --prefix=/the/install/path

Use boost

boost::signals2 example.

#include <boost/signals2.hpp>
#include <iostream>
#include <functional>
#include <numbers>

namespace signal = boost::signals2;
using std::placeholders::_1;

namespace my_space
{

using signal_type = signal::signal<float(float)>;
using slot_type = my_space::signal_type::slot_type;
using connection_type = signal::connection;

class source
{
private:
	my_space::signal_type __signal;
public:
	virtual ~source() = default;
public:
	my_space::connection_type connect(const my_space::slot_type & slot__)
	{
		return __signal.connect(slot__);
	}
public:
	float compute(float value__)
	{
		boost::optional<float> back = __signal(value__);
		if (back)
			return *back;
		else
			return 0;
	}
};

class compute
{
private:
	my_space::connection_type __connection;
public:
	virtual ~compute() = default;
public:
	compute() = delete;
	compute(my_space::source & src__):
		__connection{
			src__.connect(
				std::bind(
					&my_space::compute::calculate,
					this,
					_1
				)
			)
		}
	{
	}
	float calculate(float value__)
	{
		return value__ * value__;
	}
};

}	// namespace my_space

int main()
{
	my_space::source source;
	my_space::compute compute{source};
	float result = source.compute(std::numbers::pi);
	std::cout << "Result: " << result << std::endl;
	// Result: 9.86961
}

Compile it

> alias gpp="g++ -std=c++26"
> gpp prog.cpp -o prog
> ./prog
Result: 9.86961

Date

Apr 12, 2025

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