65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
#pragma once
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#include <iostream>
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#include <string>
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#include <cgv/signal/signal.h>
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namespace cgv {
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namespace signal {
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/// simple implementation of a streambuf that sends all written text to the write signal that is referenced from the possessing stream
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struct callback_streambuf : public std::streambuf
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{
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cgv::signal::signal<const std::string&>& write;
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callback_streambuf(cgv::signal::signal<const std::string&>& _write) : write(_write)
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{
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}
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std::streambuf *setbuf(char_type *buf, std::streamsize n)
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{
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setp(buf,buf+n-1);
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return this;
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}
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int_type overflow(int_type c)
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{
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if (c != std::char_traits<char>::eof()) {
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*pptr() = c;
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pbump(1);
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}
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int num = static_cast<int>(pptr()-pbase());
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std::string text(pbase(),num);
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write(text);
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pbump(-num);
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return c;
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}
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int sync()
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{
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int num = static_cast<int>(pptr()-pbase());
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std::string text(pbase(),num);
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write(text);
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pbump(-num);
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return num;
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}
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};
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/// connect to the write signal of the callback stream in order to process all text written to the stream
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class callback_stream : public std::ostream
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{
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protected:
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callback_streambuf buf;
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char buffer[256];
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public:
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/// signal to which all text written to the stream is sent
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cgv::signal::signal<const std::string&> write;
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/// constructor sets the stream buffer of the stream to the callback_streambuf
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callback_stream() : std::ostream(0), buf(write)
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{
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buf.setbuf(buffer,256);
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init(&buf);
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}
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};
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}
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}
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