0_0_15582335_5792.cpp:51:83: error: could not convert 'std::basic_string<char>(((const char*)"0"), (*(const std::allocator<char>*)(& std::allocator<char>())))' from 'std::string {aka std::basic_string<char>}' to 'std::string& {aka std::basic_string<char>&}'
static string _IntegerAdd(string strA, string strB, string& strCarry = string("0"))
^
0_0_15582335_5792.cpp: In static member function 'static std::string CPositiveAdder::RealNumAdd(std::string, std::string)':
0_0_15582335_5792.cpp:27:67: error: invalid initialization of non-const reference of type 'std::string& {aka std::basic_string<char>&}' from an rvalue of type 'std::string {aka std::basic_string<char>}'
string strSumLeft(CPositiveAdder::_IntegerAdd(strALeft, strBLeft));
^
0_0_15582335_5792.cpp:51:16: note: in passing argument 3 of 'static std::string CPositiveAdder::_IntegerAdd(std::string, std::string, std::string&)'
static string _IntegerAdd(string strA, string strB, string& strCarry = string("0"))
^
0_0_15582335_5792.cpp:33:70: error: invalid initialization of non-const reference of type 'std::string& {aka std::basic_string<char>&}' from an rvalue of type 'std::string {aka std::basic_string<char>}'
strSumLeft = CPositiveAdder::_IntegerAdd(strSumLeft, strCarryRight);
^
0_0_15582335_5792.cpp:51:16: note: in passing argument 3 of 'static std::string CPositiveAdder::_IntegerAdd(std::string, std::string, std::string&)'
static string _IntegerAdd(string strA, string strB, string& strCarry = string("0"))
^
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