# std::experimental::source_location::function_name

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< cpp‎ | experimental‎ | source location

constexpr const char* function_name() const noexcept; |  | (library fundamentals TS v2)

Returns the name of the function associated with the position represented by this object, if any.

### Parameters

(none)

### Return value

If this object represents a position in a body of a function, returns an implementation-defined null-terminated byte string corresponding to the name of the function.

Otherwise, an empty string is returned.

### Example

The following example shows how it is possible to use the `std::source_location::function_name()` to print a name of a function, constructor, destructor, or overloaded `operator()`.

Run this code

    #include <experimental/source_location>
    #include <iostream>
    #include <string_view>

    inline void function_name(
        const std::string_view signature = "()",
        const std::experimental::source_location& location
            = std::experimental::source_location::current())
    {
        std::cout
            << location.function_name() // <- name of the caller!
            << signature
            << '\n';
    }

    void foo() { function_name(); }

    struct S {
        S() { function_name(); }
        S(int) { function_name("(int)"); }
        S& operator=(S const&) { function_name("(const S&)"); return *this; }
        S& operator=(S&&) { function_name("(S&&)"); return *this; }
        ~S() { function_name(); }
    };

    int main()
    {
        foo();
        S p;
        S q{42};
        p = q;
        p = std::move(q);
    }

Possible output:

    foo()
    S()
    S(int)
    operator=(const S&)
    operator=(S&&)
    ~S()
    ~S()

### See also

line | return the line number represented by this object (public member function)
column | return the column number represented by this object (public member function)
file_name | return the file name represented by this object (public member function)

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