c ++ force std :: cout flush（print to screen） [英] c++ force std::cout flush (print to screen)

问题描述

我有以下代码：

std::cout << "Beginning computations..."; // output 1
computations();
std::cout << " done!\n";                  // output 2

然而，问题是输出＃1和输出＃2虚拟）。也就是说，在 calculateations（）返回之前，常常输出＃1不会被打印到屏幕上。由于输出＃1的整个目的是指示某事在后台进行（因此鼓励用户的耐心），这个问题不好。

The problem, however, is that often output #1 and output #2 appear (virtually) simultaneously. That is, often output #1 does not get printed to the screen until after computations() returns. Since the entire purpose of output #1 is to indicate that something is going on in the background (and thus to encourage patience from the user), this problem is not good.

是否有任何方法强制 std :: cout 缓冲区在 computeations（）调用之前打印？或者，是否有其他方法（使用 std :: cout 之外的其他方法）打印到标准输出，这将解决这个问题？

Is there any way to force the std::cout buffer to get printed before the computations() call? Alternatively, is there some other way (using something other than std::cout) to print to standard out that would fix this problem?

推荐答案

只需插入 std :: flush ：

std::cout << "Beginning computations..." << std::flush;

另请注意，插入 std :: endl 也会在写一个换行符后清除。

Also note that inserting std::endl will also flush after writing a newline.

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