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anonymous

almost 7 years ago

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anonymous

almost 7 years ago

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#include <string>

int main()
{
std::string best_string = "foo";

[&best_string = static_cast<const std::string&>(best_string)](const std::string& s)
{
best_string = s;
};
}

$ 
prog.cc:9:21: error: no viable overloaded '='
        best_string = s;
        ~~~~~~~~~~~ ^ ~
/opt/wandbox/clang-head/include/c++/v1/string:834:19: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const
    basic_string& operator=(const basic_string& __str);
                  ^
/opt/wandbox/clang-head/include/c++/v1/string:840:19: note: candidate function template not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const
    basic_string& operator=(__self_view __sv)  {return assign(__sv);}
                  ^
/opt/wandbox/clang-head/include/c++/v1/string:843:19: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const
    basic_string& operator=(basic_string&& __str)
                  ^
/opt/wandbox/clang-head/include/c++/v1/string:846:19: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const
    basic_string& operator=(initializer_list<value_type> __il) {return assign(__il.begin(), __il.size());}
                  ^
/opt/wandbox/clang-head/include/c++/v1/string:848:45: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const
    _LIBCPP_INLINE_VISIBILITY basic_string& operator=(const value_type* __s) {return assign(__s);}
                                            ^
/opt/wandbox/clang-head/include/c++/v1/string:849:19: note: candidate function not viable: 'this' argument has type 'const std::__1::basic_string<char>', but method is not marked const
    basic_string& operator=(value_type __c);
                  ^
prog.cc:7:5: warning: expression result unused [-Wunused-value]
    [&best_string = static_cast<const std::string&>(best_string)](const std::string& s)
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning and 1 error generated.
Exit Code:
1