55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
// 231-Cfg-OutputStreams.cpp
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// Show how to replace the streams with a simple custom made streambuf.
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// Note that this reimplementation _does not_ follow `std::cerr`
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// semantic, because it buffers the output. For most uses however,
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// there is no important difference between having `std::cerr` buffered
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// or unbuffered.
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#include <catch2/catch_test_macros.hpp>
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#include <sstream>
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#include <cstdio>
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class out_buff : public std::stringbuf {
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std::FILE* m_stream;
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public:
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out_buff(std::FILE* stream):m_stream(stream) {}
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~out_buff();
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int sync() override {
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int ret = 0;
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for (unsigned char c : str()) {
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if (putc(c, m_stream) == EOF) {
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ret = -1;
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break;
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}
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}
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// Reset the buffer to avoid printing it multiple times
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str("");
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return ret;
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}
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};
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out_buff::~out_buff() { pubsync(); }
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#if defined(__clang__)
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#pragma clang diagnostic ignored "-Wexit-time-destructors" // static variables in cout/cerr/clog
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#endif
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namespace Catch {
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std::ostream& cout() {
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static std::ostream ret(new out_buff(stdout));
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return ret;
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}
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std::ostream& clog() {
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static std::ostream ret(new out_buff(stderr));
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return ret;
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}
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std::ostream& cerr() {
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return clog();
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}
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}
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TEST_CASE("This binary uses putc to write out output", "[compilation-only]") {
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SUCCEED("Nothing to test.");
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}
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