github.com/shogo82148/std@v1.22.1-0.20240327122250-4e474527810c/math/big/decimal.go (about)

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // This file implements multi-precision decimal numbers.
     6  // The implementation is for float to decimal conversion only;
     7  // not general purpose use.
     8  // The only operations are precise conversion from binary to
     9  // decimal and rounding.
    10  //
    11  // The key observation and some code (shr) is borrowed from
    12  // strconv/decimal.go: conversion of binary fractional values can be done
    13  // precisely in multi-precision decimal because 2 divides 10 (required for
    14  // >> of mantissa); but conversion of decimal floating-point values cannot
    15  // be done precisely in binary representation.
    16  //
    17  // In contrast to strconv/decimal.go, only right shift is implemented in
    18  // decimal format - left shift can be done precisely in binary format.
    19  
    20  package big