Error 2 Error C2872 Ambiguous Symbol

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Error C2872: 'string' : Ambiguous Symbol

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Ambiguous Symbol Visual Studio

takes a minute: Sign up getting error for ambiguous symbol and need help to remove it up vote 1 down vote favorite 1 i am getting this error which i unable to remove in visual studio 2010. i am using

C++ Ambiguous Symbol Namespace

one third party library which uses its own definition for "string" Also visual studio's xstring file is there in the folder where it gets installed. now when i am trying to compile code i am getting following error 1>...\xyz.cpp(24): error C2872: 'string' : ambiguous symbol 1> could be 'third party library path\string.h(31) 1> or 'c:\program files (x86)\microsoft visual studio 10.0\vc\include\xstring(2063) : std::string' compiler is not able to understand which string definition it should use. How can i remove this error in error c2872: 'cdialogimpl' : ambiguous symbol visual studi 2010. I want the code to use third party string definition. i tried to set third party path in include directory but still i am seeing this error. Please help me. Thanks in advance c++ share|improve this question asked Feb 20 '12 at 11:27 novice 19137 Use std::string instead of just string? –BoBTFish Feb 20 '12 at 11:30 @BoBTFish "I want the code to use third party string definition." ;) –user1203803 Feb 20 '12 at 11:31 add a comment| 5 Answers 5 active oldest votes up vote 5 down vote This is an example of a namespace clash. You probably have in your code: #include <3rdPartyString.h> // declaration of 3rd party string type #include // declaration of std::string using namespace 3rdPartyNamespace; using namespace std; ... string myStr; // which string type? Compiler now doesn't know which string you want to use - one from 3rd party library or STL one. You can resolve this ambiguity by prepending namespace name to the type: 3rdPartyNamespace::string myStr; // if you want to use string from 3rd party library or std::string myStr; // if you want to use STL string Never place using namespace namespace_name; in headers but try to avoid it in source files as well. The best practice is to prepend type name as this does doesn't pollute your current namespace with the other one thus avoiding namespace clashes. share|improve this answer answered Feb 20

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn error c2872 ambiguous symbol visual c++ more about Stack Overflow the company Business Learn more about hiring developers or c2872 error c++ posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow error c2872 'iserviceprovider' ambiguous symbol Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error c2872 Visual Studio 2013 up vote 0 down http://stackoverflow.com/questions/9360375/getting-error-for-ambiguous-symbol-and-need-help-to-remove-it vote favorite I keep having this issue with this program involving templates. I apologize for posting the entire code, but it's extremely short. The problem I keep having is it claims there's an error in c2872. driver.cpp #include #include "pair.h" using namespace std; int main() { pair letters('a', 'd'); cout << "\nThe first letter is: " << letters.getFirst(); cout << "\nThe second letter is: " << letters.getSecond(); http://stackoverflow.com/questions/22977267/error-c2872-visual-studio-2013 cout << endl; system("Pause"); return 0; } Class .cpp file #include "pair.h" template pair::pair(const T& first, const T& second) { f = first; s = second; } template T pair::getFirst() const { return first; } template T pair::getSecond() const { return second; } template void pair::setFirst(const T& first, const T& second) { T temp = first; first = second; second = temp; } header file template class pair { private: T f; T s; public: pair(const T&, const T&); T getFirst() const; T getSecond() const; void setFirst(const T&, const T&); }; c++ templates share|improve this question asked Apr 10 '14 at 1:52 nelson2013 73 1 You can't separate template declarations and implementations. Put the implementation in the header file so that driver.cpp can generate all the code it needs in compile-time. Also, getFirst() and getSecond() are returning non-members (I think you meant f and s). –Suedocode Apr 10 '14 at 1:57 Also, it is useful to post the whole error message you are getting, instead of just "C2872". –M.M Apr 10 '14 at 1:58 Error 1 error C2872: 'pair' : ambiguous symbol c:\users\dale nelson\documents\uvu college stuff\cs 1410 class

here for a quick overview of the site Help Center Detailed answers to any questions you might http://stackoverflow.com/questions/16800831/what-causes-ambiguous-symbol-errors-c have Meta Discuss the workings and policies of this site About http://stackoverflow.com/questions/32636579/c-ambiguous-symbol-error Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, ambiguous symbol just like you, helping each other. Join them; it only takes a minute: Sign up What causes ambiguous symbol errors? C++ up vote 0 down vote favorite I am trying to learn C++ by doing a small windows phone app. Currently I am just following a tutorial to get to grips with developing for the error c2872 ambiguous windows phone. However, I have encountered a ambiguous signal error when trying to build the code. I am used to the niceties associated with Java and am a bit lost as to what could be causing this error. The error dump I get is: 1>c:\program files (x86)\windows phone kits\8.0\include\wrl\event.h(740): error C2872: 'EventRegistrationToken' : ambiguous symbol 1> could be 'c:\program files (x86)\windows phone kits\8.0\include\eventtoken.h(51) : EventRegistrationToken' 1> or 'c:\program files (x86)\windows phone kits\8.0\windows metadata\windows.winmd : Windows::Foundation::EventRegistrationToken' 1> c:\program files (x86)\windows phone kits\8.0\include\wrl\event.h(1035) : see reference to class template instantiation 'Microsoft::WRL::EventSource' being compiled 1>c:\program files (x86)\windows phone kits\8.0\include\wrl\event.h(814): error C2872: 'EventRegistrationToken' : ambiguous symbol 1> could be 'c:\program files (x86)\windows phone kits\8.0\include\eventtoken.h(51) : EventRegistrationToken' 1> or 'c:\program files (x86)\windows phone kits\8.0\windows metadata\windows.winmd : Windows::Foundation::EventRegistrationToken' The code is attached below - sorry for giving the whole file, but I literally dont know where to start. Any help would be greatly appreciated. Thanks #include "pch.h" #include "WindowsPhoneGame.h" #include "BasicTimer.h" //#include #include //using namespace std; using namespace Wind

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C++ ambiguous symbol error up vote 1 down vote favorite I'm building Quantlib using Boost libraries in VS2013. I built Boost using NuGet package manager in VS2013. I am getting 50 instances of ambiguous symbol error in my build. All the errors are related to the same variable: tolerance . Below is a sample cpp file where the variable is declared and then accessed. I get errors in lines 51,77, and 98, the three instance where the variable tolerance is used. The namespace is defined without any namespace_name and there is no using namespace namespace_name; line. I don't know if this is an issue or if the issue is something else. I am a total newb with C++ so I will appreciate any help to fix this. #include "tqreigendecomposition.hpp" #include "utilities.hpp" #include using namespace QuantLib; using namespace boost::unit_test_framework; namespace { Real tolerance = 1.0e-10; } void TqrEigenDecompositionTest::testEigenValueDecomposition() { BOOST_TEST_MESSAGE("Testing TQR eigenvalue decomposition..."); Array diag(5); Array sub(4,1); diag[0]=11; diag[1]=7; diag[2]=6; diag[3]=2; diag[4]=0; Real ev[5] = {11.2467832217139119, 7.4854967362908535, 5.5251516080277518, 2.1811760273123308, -0.4386075933448487}; TqrEigenDecomposition tqre(diag, sub, TqrEigenDecomposition::WithoutEigenVector); for (Size i=0; i < diag.size(); ++i) { const Real expected(ev[i]); const Real calculated(tqre.eigenvalues()[i]); if (std::fabs(expected-calculated) > tolerance) { BOOST_FAIL(std::string("wrong eigenvalue \n") << "calculated: " << calculated <<" expected : " << expect