![]() ![]() (unknown) nanoseconds value to, the naive approach is: struct Foo If we have an existing (unknown) nanoseconds value that we want to add another For example: nanoseconds f3(nanoseconds value) When we can't be sure that value isn't already its maximum, we check first,Īnd handle the error however we deem appropriate. It's no different than the typical integer case: std::int64_t f2(std::int64_t value) Represented in type 'std::_1::chrono::duration >::rep' (aka 'long long')īut this is nothing special. With clang 7's UBSan ( -fsanitize=undefined): runtime error: signed integer overflow: 9223372036854775807 + 1 cannot be If value is nanoseconds::max(), then this overflows, which we can confirm This function is obviously not always safe: nanoseconds f1(nanoseconds value) Representational bits that aren't required to be there by the standard. Will be std::int64_t and there are thus probably no "leftover" optional Its minimum rep size is 64-bit, which means in practice it Let's start with what I think is the "simplest" std::chrono::duration type, Please bear with me while I walk through a few cases to set the stage for my Use it practically and safely to avoid undefined behaviour. However, recently, I suddenly realized that I didn't know how to Talks on the design and use of the library. No person employed by, or associated with, NT or any of its affiliates is authorized to provide any information about any such Vendor Content.I've used std::chrono for years and have watched many of Howard Hinnant's If you are interested in learning more about, or investigating the quality of, any such Vendor Content you must contact the vendor, provider or seller of such Vendor Content. Please be aware that any performance information provided by a vendor should be considered hypothetical and must contain the disclosures required by NFA Rule 2-29(c). NT or any of its affiliates are not responsible for, do not approve, recommend or endorse any Vendor Content referenced on this website and it’s your sole responsibility to evaluate Vendor Content. Vendors along with their websites, products and services, collectively referred to as (“Vendor Content”), are independent persons or companies that are in no manner affiliated with NT or any if its affiliates. The content and opinions expressed on this website are those of the authors and do not necessarily reflect the official policy or position of NT or any of its affiliates. Specific questions related to a brokerage account should be sent to your broker directly. No offer or solicitation to buy or sell securities, securities derivative or futures products of any kind, or any type of trading or investment advice, recommendation or strategy, is made, given, or in any manner endorsed by any NT affiliate and the information made available on this Web site is not an offer or solicitation of any kind. This website is intended for educational and informational purposes only and should not be viewed as a solicitation or recommendation of any product, service or trading strategy. NT is an affiliated company to NinjaTrader Brokerage (“NTB”), which is a NFA registered introducing broker (NFA #0339976) providing brokerage services to traders of futures and foreign exchange products. This website is hosted and operated by NinjaTrader, LLC (“NT”), a software development company which owns and supports all proprietary technology relating to and including the NinjaTrader trading platform. No representation is being made that any account will or is likely to achieve profit or losses similar to those shown. Simulated trading programs in general are also subject to the fact that they are designed with the benefit of hindsight. Also, since the trades have not been executed, the results may have under-or-over compensated for the impact, if any, of certain market factors, such as lack of liquidity. View Full Risk Disclosure.ĬFTC Rules 4.41 - Hypothetical or Simulated performance results have certain limitations, unlike an actual performance record, simulated results do not represent actual trading. Past performance is not necessarily indicative of future results. Only risk capital should be used for trading and only those with sufficient risk capital should consider trading. Risk capital is money that can be lost without jeopardizing one’s financial security or lifestyle. An investor could potentially lose all or more than the initial investment. Futures, foreign currency and options trading contains substantial risk and is not for every investor.
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