triopre.blogg.se - Define nepers persecond

#DEFINE NEPERS PERSECOND DRIVER#
#DEFINE NEPERS PERSECOND SOFTWARE#
#DEFINE NEPERS PERSECOND CODE#
#DEFINE NEPERS PERSECOND SERIES#

Fractional unit powers are not supported in general.

So if you are doing a lot of financial calculations or accounting use something more specific for currency manipulations.

Currency is supported as a unit but it is not recommended to use this for anything beyond basic financial calculations.

#DEFINE NEPERS PERSECOND SERIES#

The library uses floating point and double precision for the multipliers which is generally good enough for most engineering contexts, but does come with the limits and associated loss of precision for long series of calculations on floating point numbers.

The powers represented by units by default are limited see Unit representation and only normal physical units or common operations are supported, this can be modified at compile time to support a much broader range at the expense of size and computation.

But there is a configuration file that takes in the initial data and you would like to broadly support different units on the input Say a velocity, internally everything is in meters per second.

#DEFINE NEPERS PERSECOND CODE#

In the library code itself the units are standardized and well defined. For example if you have a library that does some computations with physical units. The primary use case for the library is string operations and conversion. In some cases it also has some notion of commodities, and support for existing unit standards for strings and naming. It supports units used in power systems and electrical engineering, and conversions between them as well as some typical assumptions for supporting conversions. It supports mathematical operations on units and measurements which is constexpr where possible. It supports conversion of units to and from strings. This library is an engineering library, created to represent a huge variety of units and measurements in a simple data type instead of a proliferation of templates. The units library provides a library that supports units and operations on them where many of the units in use are unknown at compile time and conversions and uses are dealt with at run time, and may be of a wide variety of units. This library does NOT provide compile time checking of units. The primary use of the conversions is at run-time to convert user input/output to/from internal units, it is not to provide strict type safety or dimensional analysis, though it can provide some of that. It was desired that the unit representation be a compact type(<=8 bytes) that is typically passed by value, that can represent a wide assortment of units and arbitrary combinations of units. The library also has its origin in power systems so support for per-unit operations was also lacking in the alternatives.

Sometimes the unit type needs to be used inside virtual function calls which must strictly define a type. And be able to use the unit as a singular type that could contain any unit, and not introduce a huge number of types to represent all possible units.

#DEFINE NEPERS PERSECOND DRIVER#

The main driver is converting units, often represented by strings, to a standardized unit set when dealing with user input and output. Table of contentsĪ unit library was needed to be able to represent units of a wide range of disciplines and be able to separate them from the numerical values for use in calculations. Namespaces, function names, and code organization is subject to change, input is welcome.

#DEFINE NEPERS PERSECOND SOFTWARE#

This software was developed for use in LLNL/GridDyn, and is currently a work in progress (though getting closer). A library that provides runtime unit values, instead of individual unit types, for the purposes of working with units of measurement at run time possibly from user input.