首先，ptr 初始化得太早，而 argv[1] 不可用。
ptr
argv[1]
其次，main局部变量run与用于设置ptr的全局run无关，该全局变量在中使用>玩具1。
main
run
中使用>玩具1
由于我们不知道toy是什么，我们无法回答更多。 8-DK 答案是一种可能性。
toy
First, ptr is initialised too early, at a time where argv[1] is not available.
Second, main local variable run is not related to global run used to set ptr that is used in Toy1.
Toy1
As we don't know what toy is we can not answer much more. 8-DK answer's is one possibility.
这是我测试过的代码。试试这个
#include <iostream> #include <fstream> #include <math.h> struct run_t { std::string file; }; run_t run; class POINTER{ public: POINTER(std::string file , int num){std::cout << "POINTER::POINTER(std::string file , int num)file " << file << std::endl;}; double func(double a, double b, double c) { POINTER *toy(std::string file , int num); return (double)0; } }; POINTER *toy(std::string file , int num) { POINTER* ptr = new POINTER(file , num); std::cout << "POINTER *toy(std::string file , int num) file " << file << std::endl; return ptr; } const POINTER * ptr; double Toy1(double a, double b, double c) { POINTER * ptrCst = const_cast<POINTER *>(ptr); return ptrCst->func(a, b, c); }; double Toy2(double d) { double factor = pow(d, 2); //some dummy prefactor return factor * Toy1(4, 5, 6); }; int main(int argc, char* argv[]) { run.file = argv[1]; POINTER * ptrCst = const_cast<POINTER *>(ptr); ptrCst = toy(run.file, 0); std::cout << Toy2(1) << std::endl; while(1); return 0; }
Here is the code I have tested. Try this
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首先，
ptr初始化得太早，而argv[1]不可用。其次，
main局部变量run与用于设置ptr的全局run无关，该全局变量在中使用>玩具1。由于我们不知道
toy是什么，我们无法回答更多。 8-DK 答案是一种可能性。First,
ptris initialised too early, at a time whereargv[1]is not available.Second,
mainlocal variablerunis not related to globalrunused to setptrthat is used inToy1.As we don't know what
toyis we can not answer much more. 8-DK answer's is one possibility.这是我测试过的代码。试试这个
Here is the code I have tested. Try this