Struct Vector and iteration C++11

Question

I have simple question. According to other examples my iteration for is correct but Eclipse throws me errors... My Function

billing::billing(std::istream &is) {
    unsigned day;
    std::string number;
    float time;
    struct call call;
    while (!is.eof()) {
        is >> day >> number >> time;
        call.day = day;
        call.number = number;
        call.time = time;
        blng_.push_back(call);
    }
    for(std::vector<call>::const_iterator it; it = blng_.begin(); it != blng_.end(); ++it)
        // THROWS HERE ERRORS!
        std::cout << it->day << std::endl;
}

After compiling he throws me something like that

expected a type, got 'call' billing.cpp     
'it' was not declared in this scope billing.cpp 
expected ';' before 'it'    billing.cpp 
expected ')' before ';' token   billing.cpp
invalid type in declaration before 'it' billing.cpp
template argument 2 is invalid  billing.cpp
the value of 'call' is not usable in a constant expression  billing.cpp
type/value mismatch at argument 1 in template parameter list for           
'template<class _Tp, class _Alloc> class std::vector'   billing.cpp

According to this How do I iterate over a Constant Vector? topic it should be working but it isn't and I have no freq idea why. When i change this whole std::vectro... to auto it works!

You went and created an object named `call`, hiding the type's name. — juanchopanza, Apr 06 '15 at 21:48
Ah you are right! I was looking thousand times on it and could not find it lol. — FilOle, Apr 06 '15 at 21:52

score 1 · Answer 1 · edited May 23 '17 at 12:13

1

In C++11 you can rewrite:

for(std::vector<call>::const_iterator it = blng_.begin(); it != blng_.end(); ++it)
    std::cout<<it->day<<std::endl;;

as

for(const auto& c: blng_)
    std::cout << c.day << std::endl;

Additional Note:

You should never loop with eof(): Why is iostream::eof inside a loop condition considered wrong?

You should really do something like this:

while(is >> day >> number >> time) {

    call.day = day;
    call.number = number;
    call.time = time;
    blng_.push_back(call);
}

edited May 23 '17 at 12:13

Community

1
1

answered Apr 06 '15 at 21:57

Galik

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Oh ye I was translating some parts of code to English and copied it wrong. But the problem was as juanchopanza wrote above. Thanks anyway! :) I rly like the last one! Galik Hmm and thanks for EOF note i will read it right away! – FilOle Apr 06 '15 at 22:04

Struct Vector and iteration C++11

1 Answers1