Working error system I believe

include/Errors.hpp

@@ -3,7 +3,7 @@
 #define _NB_ERROR
 
 #include <exception>
-#include <string.h>
+#include <memory>
 #include <string>
 #include <type_traits>
 #include <unordered_map>
@@ -16,24 +16,20 @@ template<class ErrorType>
 class ErrorBase : public std::exception {
 public:
     static std::string lookup(unsigned int);
-
-    virtual const char* what() const noexcept override final {
-        return static_cast<const ErrorType*>(this)->_msg.c_str();
-    };
     unsigned int code() const noexcept {
         return static_cast<const ErrorType*>(this)->_code;
     };
+    virtual const char* what() const noexcept override final { return _msg.c_str(); };
 
 protected:
     ErrorBase() = default;
     ErrorBase(
         const unsigned int code,
         std::string msg,
-        std::exception* const trace,
         unsigned int line=0,
         std::string filename=""
-    ) noexcept : _code{code} {
-         static_assert(std::is_same<const std::unordered_map<unsigned int, const char*>, decltype(ErrorType::ErrorMessages)>::value,
+    ) noexcept : _code{code}, _msg{""} {
+        static_assert(std::is_same<const std::unordered_map<unsigned int, const char*>, decltype(ErrorType::ErrorMessages)>::value,
             "const std::unordered_map<unsigned int, const char*> ErrorMessages must be "
             "a class member."
         );
@@ -45,35 +41,86 @@ protected:
             "const std::string type must be a class member."
         );
 
-        _msg = std::string(ErrorType::type);
-        _msg += ":" + std::to_string(code);
+        _msg += std::string(ErrorType::type);
+        _msg += "-" + std::to_string(_code);
         if (line && filename.size()) {
             _msg += " in \'" + filename + "\':" + std::to_string(line);
         }
-        _msg += "\n\t" + msg;
-        if (trace) {
-            _msg += "\nTraceback - " + std::string(trace->what());
-        }
+        _msg += "\n    " + msg;
     } 
+    ErrorBase(
+        const unsigned int code,
+        std::string msg,
+        const std::exception& trace,
+        unsigned int line=0,
+        std::string filename=""
+    ) noexcept : ErrorBase(code, msg, line, filename) {
+        std::string what_msg(trace.what());
+        std::string::size_type newline_pos = what_msg.find("\n");
+        while(newline_pos != std::string::npos) {
+            what_msg.replace(newline_pos, 1, "\n  ");
+            newline_pos = what_msg.find("\n", newline_pos+1);
+        }
+        _msg += "\n    Trace: " + what_msg;
+    }
+    ErrorBase(
+        const unsigned int code,
+        unsigned int line=0,
+        std::string filename=""
+    ) noexcept : ErrorBase(
+        code, 
+        ErrorBase<ErrorType>::lookup(code),
+        line,
+        filename
+    ) {}
 
-    const unsigned int _code;
+    ErrorBase(
+        const unsigned int code,
+        const std::exception& trace,
+        unsigned int line=0,
+        std::string filename=""
+    ) noexcept : ErrorBase(
+        code, 
+        ErrorBase<ErrorType>::lookup(code),
+        trace,
+        line,
+        filename
+    ) {}
+    
+    unsigned int _code;
     std::string _msg;
 };
 
-
 class Error : public ErrorBase<Error> {
 public:
-    Error(unsigned int code, std::exception* const trace=nullptr) 
+    enum ErrorCodes : unsigned int {
+        GENERAL, UNDEFINED, BADERRORCODE
+    };
+
+    Error(unsigned int code) : ErrorBase<Error>(code, ErrorBase<Error>::lookup(code)) {}
+    Error(unsigned int code, const std::exception& trace) 
         : ErrorBase<Error>(code, ErrorBase<Error>::lookup(code), trace) {}
 
-    enum ErrorCodes : unsigned int {
-        UNDEFINED, BADERRORCODE
-    };
+    friend ErrorBase<Error>;
+
+protected:
     static const std::string type;
     static const ErrorCodeMap ErrorMessages;
 
 };
 
+/* 
+template<class ErrorType>
+ErrorBase<ErrorType>::ErrorBase(
+    unsigned int code,
+    std::string msg,
+    const std::exception& trace,
+    unsigned int line,
+    std::string filename
+) noexcept 
+    : ErrorBase<ErrorType>(code, msg, std::make_shared<Error>(trace), line, filename) {}
+ */
+
 template<class ErrorType>
 std::string ErrorBase<ErrorType>::lookup(unsigned int code) {
     for (auto kv : ErrorType::ErrorMessages) {

src/NBCoreUtils/Errors.cpp

@@ -2,10 +2,9 @@
 
 namespace nb {
 
-// class Error
-
 const std::string Error::type =  "Error";
-const ErrorCodeMap Error::ErrorMessages = ErrorCodeMap{
+const ErrorCodeMap Error::ErrorMessages = {
+    {ErrorCodes::GENERAL, "General std::exception."},
     {ErrorCodes::UNDEFINED, "Undefined / general error."},
     {ErrorCodes::BADERRORCODE, "Unrecognized error code."}
 };

tests/ErrorTest/main.cpp

@@ -5,7 +5,9 @@ using namespace nb;
 
 class TestError : public ErrorBase<TestError> {
 public:
-    TestError(unsigned int code, std::exception* const trace=nullptr) 
+    TestError(unsigned int code) 
+        : ErrorBase<TestError>(code, ErrorBase<TestError>::lookup(code)) {}
+    TestError(unsigned int code, const std::exception& trace) 
         : ErrorBase<TestError>(code, ErrorBase<TestError>::lookup(code), trace) {}
     
     enum ErrorCodes : unsigned int {
@@ -24,11 +26,11 @@ const ErrorCodeMap TestError::ErrorMessages{
 };
 
 int main() {
-    TestError d(TestError::ErrorCodes::D);
-    TestError c(TestError::ErrorCodes::C, &d);
-    TestError b(TestError::ErrorCodes::B, &c);
-    TestError a(TestError::ErrorCodes::A, &b);
-    throw Error(Error::ErrorCodes::UNDEFINED, &a);
+    TestError d(TestError::ErrorCodes::D, std::out_of_range("hey"));
+    TestError c(TestError::ErrorCodes::C, d);
+    TestError b(TestError::ErrorCodes::B, c);
+    TestError a(TestError::ErrorCodes::A, b);
+    throw Error(Error::ErrorCodes::UNDEFINED, a);
 
     return 0;
 }