1 // 231-Cfg-OutputStreams.cpp 2 // Show how to replace the streams with a simple custom made streambuf. 3 4 // Note that this reimplementation _does not_ follow `std::cerr` 5 // semantic, because it buffers the output. For most uses however, 6 // there is no important difference between having `std::cerr` buffered 7 // or unbuffered. 8 9 #define CATCH_CONFIG_NOSTDOUT 10 #define CATCH_CONFIG_MAIN 11 #include <catch2/catch.hpp> 12 13 class out_buff : public std::stringbuf { 14 std::FILE* m_stream; 15 public: 16 out_buff(std::FILE* stream) :m_stream(stream) {} 17 ~out_buff() { pubsync(); } 18 int sync() { 19 int ret = 0; 20 for (unsigned char c : str()) { 21 if (putc(c, m_stream) == EOF) { 22 ret = -1; 23 break; 24 } 25 } 26 // Reset the buffer to avoid printing it multiple times 27 str(""); 28 return ret; 29 } 30 }; 31 32 namespace Catch { 33 std::ostream& cout() { 34 static std::ostream ret(new out_buff(stdout)); 35 return ret; 36 } 37 std::ostream& clog() { 38 static std::ostream ret(new out_buff(stderr)); 39 return ret; 40 } 41 std::ostream& cerr() { 42 return clog(); 43 } 44 } 45 46 47 TEST_CASE("This binary uses putc to write out output", "[compilation-only]") { 48 SUCCEED("Nothing to test."); 49 } 50
