std :: round不是Android上std的成员 [英] std::round is not a member of std on android

问题描述

我正在为android& amp;构建的Qt应用程序上使用C ++ 11中的std::round. iOS.但是在android上，我得到的错误是 尽管包含cmath标头，但std::round is not a member of std也是如此.

I am using std::round from C++ 11 on a Qt app built for android & iOS. But on android, I get the error that std::round is not a member of std in spite of including the cmath header.

如何使std::round在android上工作?是否有std::round的替代品?

How can I make std::round work on android ? Is there an alternative to std::round ?

以下是我的android环境:

Following is my android environment:

ANDROID_NDK_PLATFORM = android-23
NDK version          = r13b
ANDROID_NDK_TOOLCHAIN_VERSION = 4.9

推荐答案

Android-NDK中缺少cmath标头中的一些功能，请参见

Looks like a few functions from the cmath header are missing from the Android-NDK, see here for more details.

但是，实现自己的round函数非常容易:

It's very easy to implement your own round function however:

template<typename T>
T round(T v) {
  return int(v + 0.5);
}

或在此处中查看其他建议/实现.

Or check other suggestions/implementations here.

这篇关于std :: round不是Android上std的成员的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！