visual-c++

问题 I am trying to explicitly instantiate a templated function of type U inside a templated class of type T. My code below generates a warning and the linker does not find the explicit instantiation of ReinterpretAs() . Can anyone spot the error or advise on how to do this? I am using VC++ 2010. template<typename T> class Matrix { public: template<typename U> Matrix<U> ReinterpretAs() const; }; template<typename T> template<typename U> Matrix<U> Matrix<T>::ReinterpretAs() const { Matrix<U> m; //

问题 I have a tlb files that contains some function declaration that I need to use. If I use #import "type_library.tlb" I can correclty reference the function from my code: tlb_namespace::required_function(); But when I compile the project the linker says that tlb_namespace::required_function is an unresolved external symbol. How can I succesfully build this kind of project? EDIT : I have used the same type library in a Dummy VBA access project. I have added the reference to the type library and I

问题 I have a tlb files that contains some function declaration that I need to use. If I use #import "type_library.tlb" I can correclty reference the function from my code: tlb_namespace::required_function(); But when I compile the project the linker says that tlb_namespace::required_function is an unresolved external symbol. How can I succesfully build this kind of project? EDIT : I have used the same type library in a Dummy VBA access project. I have added the reference to the type library and I

问题 I have a tlb files that contains some function declaration that I need to use. If I use #import "type_library.tlb" I can correclty reference the function from my code: tlb_namespace::required_function(); But when I compile the project the linker says that tlb_namespace::required_function is an unresolved external symbol. How can I succesfully build this kind of project? EDIT : I have used the same type library in a Dummy VBA access project. I have added the reference to the type library and I

问题 #include <iostream> #include <string> void* operator new(size_t size) { std::cout << "Allocated: " << size << " Bytes\n"; return malloc(size); } void operator delete(void* var) { std::cout << "Deleted\n"; free(var); } int main() { std::string name0 = "Ahmed Zaki Marei"; //std::string name1 = "Lara Mohammed"; std::cout << name0 << "\n"; //std::cout << name1 << "\n"; } When I try to run this code it gives me this output: Allocated: 8 Bytes Allocated: 32 Bytes Ahmed Zaki Marei Deleted Deleted

问题 I have two source files, a.cpp and b.cpp . In a.cpp , I have a function, foo : namespace ns { void foo() { std::cout << "foo!"; } } In b.cpp , I have another function in namespace ns in which I'd like to prototype and call foo : namespace ns { void bar() { void foo(); foo(); } } While the above is syntactically valid, it leads the compiler to think that foo is in the global namespace (or at least that's what I've deduced from the linker errors I get when I do this). My first two ideas to fix

问题 I have two source files, a.cpp and b.cpp . In a.cpp , I have a function, foo : namespace ns { void foo() { std::cout << "foo!"; } } In b.cpp , I have another function in namespace ns in which I'd like to prototype and call foo : namespace ns { void bar() { void foo(); foo(); } } While the above is syntactically valid, it leads the compiler to think that foo is in the global namespace (or at least that's what I've deduced from the linker errors I get when I do this). My first two ideas to fix

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I am new to c++ . I was trying to write following code to fill up each byte of array with new values without overriding others. Each

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I am new to c++ . I was trying to write following code to fill up each byte of array with new values without overriding others. Each

问题 I was intending to write a memorization pattern in C++ and ended up with the following approach std::function<int(int)> Memoize(std::function<int(int)> fn) { std::map<int, int> memo; std::function<int(int)> helper = [=](int pos) { if (memo.count(pos) == 0) { memo[pos] = fn(pos); } return memo[pos]; }; return helper; } Strangely, my compiler VS 2012, refused to compile with the following error 1>Source1.cpp(24): error C2678: binary '[' : no operator found which takes a left-hand operand of