stdcapture: capture stdout/stderr

Capture stdout/stderr streams, e.g. for forwarding content to other streams.

All credits go to rmflow, Sir Digby Chicken Caesar, and Staszek who proposed this implementation on StackOverflow.

Building

mkdir build
cd build
cmake ..
make

Usage Example

#include "stdcapture/stdcapture.h"

#include <iostream>

int main(int argc, char* argv[])
{
	using namespace std::capture;

	// Perform stdout capture.
	std::string captured;
	{
		CaptureStdout cap([&](const char* buf, size_t szbuf)
		{
			captured += std::string(buf, szbuf);
		});
		std::cout << "Hello, stdout!" << std::endl;
	}

	// Print out what has been captured from stdout so far.
	std::cout << "Captured from stdout: " << captured;

        // Perform stderr capture.
	captured.clear();
	{
	        CaptureStderr cap([&](const char* buf, size_t szbuf)
		{
			captured += std::string(buf, szbuf);
		});
	        std::cerr << "Hello, stderr!" << std::endl;
	}

        // Print out what has been captured from stderr so far.
        std::cout << "Captured from stderr: " << captured;

	return 0;
}

Sample output:

Captured from stdout: Hello, stdout!
Captured from stderr: Hello, stderr!