ppLorins’s gists

ppLorins / shared_mutex.hpp

Created May 10, 2018 13:26

boost::shared_mutex

	class upgrade_mutex
	{
	typedef boost::mutex mutex_t;
	typedef boost::condition_variable cond_t;
	typedef unsigned count_t;

	mutex_t mut_;
	cond_t gate1_;
	cond_t gate2_;
	count_t state_;

ppLorins / sample.py

Created May 31, 2018 07:22

demonstrate a pdfrw problem

	import os
	import pdfrw

	INVOICE_TEMPLATE_PATH = 'sample-template.pdf'
	INVOICE_OUTPUT_PATH = 'sample-output.pdf'

	ANNOT_KEY = '/Annots'
	ANNOT_FIELD_KEY = '/T'
	ANNOT_VAL_KEY = '/V'
	ANNOT_RECT_KEY = '/Rect'

ppLorins / nanosecond.cc

Last active November 25, 2018 10:17

A std::chrono::nanoseconds issue found under MSVC.

	#include <stdio>
	#include <chrono>

	/* Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24215.1 for x86 */

	int main(int argc, char** argv)
	{
	//auto _nano = std::chrono::nanoseconds(3 * 1000 * 1000 * 1000); //wrong
	auto _nano = std::chrono::duration<uint32_t, std::ratio<1, 1000000000>>(3 * 1000 * 1000 * 1000); //right

ppLorins / c++_async_stream_client.cc

Created May 28, 2019 20:13

For grpc/grpc#19159

	/*
	*
	* Copyright 2016, Google Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright

ppLorins / windows_precision_issue.cc

Created June 12, 2019 16:41

std::chrono::system_clock::now() precision problem under windows .

	#include <random>
	#include <chrono>

	int main(int argc, char** argv){

	char sz_time_buf[1024] = { 0 };

	std::random_device rd;
	std::mt19937 gen(rd());
	std::uniform_int_distribution<unsigned long> dis(1,1000);

ppLorins / subclass_pointer_convert2_parentclass_pointer.cc

Created June 17, 2019 07:52

subclass pointer convert2 parent class pointer issue

	#include<iostream>

	class CPartialBase {
	public:

	CPartialBase() {
	std::cout << "CPartialBase this:" << this << std::endl;
	}

	virtual void funcPart() = 0;

ppLorins / greeter_async_mixed_server.cc

Last active March 20, 2021 00:42

an example for writing an unary and bidi-stream mixed version of c++ async grpc server.

	/*
	*
	* Copyright 2015 gRPC authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*

ppLorins / bidi-server-cus.cc

Created July 18, 2019 07:22

an example for the bidirectional streaming async grpc c++ server.

	/*
	*
	* Copyright 2016, Google Inc.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	*
	* * Redistributions of source code must retain the above copyright

ppLorins / greeter_async_server.cc

Created July 18, 2019 07:23

an example for an unary async grpc c++ server.

	/*
	*
	* Copyright 2015 gRPC authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*

ppLorins / greeter_proxy_server.cc

Created July 18, 2019 07:34

an example for the proxy async grpc c++ server forwarding requests for unary and bidi stream servers.

	/*
	*
	* Copyright 2015 gRPC authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*

arthur ppLorins