string argv[] redefinition error C++

Question

I came across to redefinition error when pass string(argv[]) to class constructor as argument. The sample codes are as follows. cA1 produced redefinition error but all cA2, cA3, cA4, and func are fine. Could anyone help me on it?

class A
{
public:
    A(string String1, string String2);
    ~A();

};

void func(string String1, string String2)
{

}

void main(int argc, char** argv)
{
    //error C2086: 'std::string argv[]' : redefinition
    A cA1(string(argv[1]), string(argv[2]));

    string String1 = string(argv[1]);
    string String2 = string(argv[2]);
    //fine 
    A cA2(String1, String2);

    //fine 
    A cA3(argv[1], argv[2]);

    //fine
    A cA4(string(argv[1]).c_str(), string(argv[2]).c_str());

    //fine
    func(string(argv[1]), string(argv[2]));
}

You should include your error output as well. – robert Sep 10 '15 at 23:59 — robert, Sep 10 '15 at 23:59
@robert I put the error output on the comments – Jackypengyu Sep 11 '15 at 00:16 — Jackypengyu, Sep 11 '15 at 00:16

score 3 · Answer 1 · edited May 23 '17 at 12:14

3

A cA1(string(argv[1]), string(argv[2])); doesn't call your constructor, however, it declares a function name cA1_{'Most vexing parse: why doesn't A a(()); work?'}, with parameters string(argv[1]) and string(argv[2]) both having same argument variable name argv, hence the error

edited May 23 '17 at 12:14

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answered Sep 10 '15 at 23:38

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string argv[] redefinition error C++

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