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I'm trying to convert a std::string stored in a std::vector to an integer and pass it to a function as a parameter.
This is a simplified version of my code:
vector <string> record;
functiontest(atoi(record[i].c_str));
My error is as follows:
error: argument of type ‘const char* (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::)()const’ does not match ‘const char*’
How can I do this?
998
One effective way to convert a string object into a numeral int is to use the stoi() function. This method is commonly used for newer versions of C++, with is being introduced with C++11. It takes as input a string value and returns as output the integer version of it.
To convert from string representation to integer value, we can use std::stringstream. if the value converted is out of range for integer data type, it returns INT_MIN or INT_MAX. Also if the string value can't be represented as an valid int data type, then 0 is returned.
In C++, the stoi() function converts a string to an integer value. The function is shorthand for “string to integer,” and C++ programmers use it to parse integers out of strings.
The stoi function was introduced in C++11 and is defined in the header <string> . It throws std::invalid_argument or std::out_of_range exception on a bad input or integer overflow, respectively.
With C++11:
int value = std::stoi(record[i]);
record[i].c_str
is not the same as
record[i].c_str()
You can actually get this from the error message: the function expects a const char*, but you're providing an argument of type const char* (std::basic_string<char, std::char_traits<char>, std::allocator<char> >::)()const which is a pointer to a member function of the class std::basic_string<char, std::char_traits<char>, std::allocator<char> > that returns a const char* and takes no arguments.
35
Use stringstream from standard library. It's cleaner and it's rather C++ than C.
int i3;
std::stringstream(record[i]) >> i3;
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