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OStream helper class

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This commit is contained in:
Pavel Kirienko 2014-08-10 21:33:30 +04:00
parent c32260137c
commit 93e84ab56c
2 changed files with 70 additions and 0 deletions
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60
libuavcan/include/uavcan/helpers/ostream.hpp Normal file
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@ -0,0 +1,60 @@
/*
* Copyright (C) 2014 Pavel Kirienko <pavel.kirienko@gmail.com>
*/
#pragma once
#include <uavcan/util/templates.hpp>
#include <cstdio>
namespace uavcan
{
/**
* Compact replacement for std::ostream for use on embedded systems.
* Can be used for printing UAVCAN messages to stdout.
*
* Relevant discussion: https://groups.google.com/forum/#!topic/px4users/6c1CLNutN90
*
* Usage:
* OStream::instance() << "Hello world!" << OStream::endl;
*/
class OStream : uavcan::Noncopyable
{
OStream() { }
public:
static OStream& instance()
{
static OStream s;
return s;
}
static OStream& endl(OStream& stream)
{
std::printf("\n");
return stream;
}
};
OStream& operator<<(OStream& s, long long x) { std::printf("%lld", x); return s; }
OStream& operator<<(OStream& s, unsigned long long x) { std::printf("%llud", x); return s; }
OStream& operator<<(OStream& s, long x) { std::printf("%ld", x); return s; }
OStream& operator<<(OStream& s, unsigned long x) { std::printf("%lu", x); return s; }
OStream& operator<<(OStream& s, int x) { std::printf("%d", x); return s; }
OStream& operator<<(OStream& s, unsigned int x) { std::printf("%u", x); return s; }
OStream& operator<<(OStream& s, short x) { return operator<<(s, static_cast<int>(x)); }
OStream& operator<<(OStream& s, unsigned short x) { return operator<<(s, static_cast<unsigned>(x)); }
OStream& operator<<(OStream& s, long double x) { std::printf("%Lg", x); return s; }
OStream& operator<<(OStream& s, double x) { std::printf("%g", x); return s; }
OStream& operator<<(OStream& s, float x) { return operator<<(s, static_cast<double>(x)); }
OStream& operator<<(OStream& s, char x) { std::printf("%c", x); return s; }
OStream& operator<<(OStream& s, const char* x) { std::printf("%s", x); return s; }
OStream& operator<<(OStream& s, OStream&(*manip)(OStream&)) { return manip(s); }
}

10
libuavcan/test/dsdl_test/dsdl_uavcan_compilability.cpp
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@ -4,6 +4,8 @@
#include <gtest/gtest.h>
#include <uavcan/helpers/ostream.hpp>
#include <uavcan/Timestamp.hpp>
#include <uavcan/FigureOfMerit.hpp>
#include <uavcan/mavlink/Message.hpp>
@ -112,3 +114,11 @@ TEST(Dsdl, Streaming)
std::cout << os.str();
ASSERT_EQ(Reference, os.str());
}
TEST(Dsdl, OStream)
{
root_ns_a::Deep ps;
ps.a.resize(2);
uavcan::OStream::instance() << ps << uavcan::OStream::endl;
}