有一个C ++等价于Java的BigDecimal？ [英] Is there a C++ equivalent to Java's BigDecimal?

问题描述

我在寻找一个可以做十进制浮点运算的C ++类。通过 http://speleotrove.com/decimal/ 可以看到人们已经写入和未维护的各种类的链接。挖掘decNumber ++的东西导致我一些电子邮件显示GCC将最终支持此功能。 （正式名为ISO / IEC TR 24733）

I'm looking for a C++ class that can do decimal floating point arithmetic. Looking through http://speleotrove.com/decimal/ there are links to all sorts of classes that people have written and not maintained. Digging through the decNumber++ stuff led me to some emails showing that GCC will eventually support this functionality. (Formally known as ISO/IEC TR 24733)

我正在寻找一些我可以用来替代float或double的东西，在自己的项目中使用。希望开源。

I'm looking for something I can use as a drop-in replacement for float or double, something that other people are using in their own projects. Hopefully open source.

谢谢！

编辑：我应该指出，代表价格。因此我需要EXACT小数，而不是巨大的小数。

I should point out that I'm trying to use this to represent prices. So I need EXACT decimals, not HUGE decimals.

推荐答案

存在一个名为 GMP（GNU多精度库），它支持这一点，并且也有C ++绑定，但是说实话，C ++接口是有点bit懒和过时。

There exists a huge library called GMP (GNU multiple precision library) which supports this and also has C++ bindings, though to be honest the C++ interface is a bit wonky and outdated.

在文档中的一个例子中，下面创建了一个至少有500位精度的 f 浮点：

An example from the documentation, the following creates a float called f with at least 500 bits of precision:

mpf_class f(1.5, 500);

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