CODEWITHSUNDEEP
c++stringtemporary-objects
leejun
leejun

Reputation: 101

Why I don’t have to free string from c_str function of std::string?

Why I don’t have to free string from c_str function of std::string? How the function generate const char* and how it be destroyed?

Upvotes: 5

Views: 661

Answers (1)

Tas
Tas

Reputation: 7111

The const char* return from c_str() is managed by the std::string itself, and is destroyed when the std::string goes out of scope. In this regard, one must be careful they don't attempt to use the pointer returned from c_str() after the std::string is destroyed:

const char* getName()
{
    std::string name = "Joe";
    return name.c_str();
}

The above is wrong because when name is destructed as getName returns, the pointer will become invalid.

Upvotes: 5

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