How to force std::stringstream operator >> to read an entire string?

c++, stdstring, stl, stringstream

Solution

As operator >> is not satisfying our requirement when T=string, we can write a specific function for [T=string] case. This may not be the correct solution. But, as a work around have mentioned.

Please correct me if it won't satisfy your requirement.

I have written a sample code as below:

#include <iostream>
#include <sstream>
#include <string>

using namespace std;

template <class T>
class Data
{
    T m_value;
    public:
    void set(const T& val);
    T& get();
};

template <class T>
void Data<T>::set(const T& val)
{
    stringstream ss;
    ss << val;
    ss >> m_value;
}

void Data<string>::set(const string& val)
{
    m_value = val;
}

template <class T>
T& Data<T>::get()
{
    return m_value;
}

int main()
{
    Data<int> d;
    d.set(10);
    cout << d.get() << endl;

    Data<float> f;
    f.set(10.33);
    cout << f.get() << endl;

    Data<string> s;
    s.set(string("This is problem"));
    cout << s.get() << endl;
}

Problem

How to force std::stringstream operator >> to read an entire string instead of stopping at the first whitespace? I've got a template class that stores a value read from a text file: ``` template <typename T> class ValueContainer { protected: T m_value; public: /* ... */ virtual void fromString(std::string & str) { std::stringstream ss; ss << str; ss >> m_value; } /* ... */ }; ``` I've tried setting/unsetting stream flags but it didn't help. Clarification The class is a container template with automatic conversion to/from type T. Strings are only one instance of the template, it must also support other types as well. That is why I want to force operator >> to mimic the behavior of std::getline.

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