"No matching function" error

crystalattice · #1 02-Dec-2004, 16:48

When trying to compile my program, I get:

Code:

/home/cody/Projects/wavelength/src/wavelength.cpp:20: no matching function for call to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::wavelength()'

It's referring to the cout line of my main program, but I don't understand exactly what it's trying to tell me. AFAIK, the cout line should be calling for the wavelength() function for a specific color, which the user entered.

Any ideas? Thanks. (As the files are somewhat long, I thought it best to just attach them.)

LuciWiz · #2 03-Dec-2004, 04:03

I really don't get your code.
You have:

CPP / C++ / C Code:

	string theColor;
	cin >> theColor;

	cout << "\nThe corresponding wavelength is " << theColor.wavelength() << endl;

But wavelength is a method in class Color, not in std::string; that's what the compiler is complaining about.

I kind of got the idea of what you are trying to accomplish, but come on!

Best regards,
Luci

LuciWiz · #3 03-Dec-2004, 04:32

I see you have a conversion constructor for Color, but it is an abstract class and can't instantiate it!
Plus I think you need something like this to "invoke" the constructor:

CPP / C++ / C Code:

Color color = theColor;

I'm sure you head something (really complicated

) in mind when you wrote this, but (at least) I need some further explanations to follow you. I guess I'm kind of tired - can't wait for the weekend

Kind regards,
Luci

[edit]
Where are these things defined? (things = RED, ORANGE...)

CPP / C++ / C Code:

	if (colorString == "RED")                          // map to ColorValue
		myName = RED;
	else if (colorString == "ORANGE")
		myName = ORANGE;
	else if (colorString == "YELLOW")
		myName = YELLOW;
	else if (colorString == "GREEN")
		myName = GREEN;
	else if (colorString == "BLUE")
		myName = BLUE;
	else if (colorString == "INDIGO")
		myName = INDIGO;
	else if (colorString == "VIOLET")
		myName = VIOLET;

[/edit]

crystalattice · #4 03-Dec-2004, 09:57

Honestly, I'm just tired of fighting w/ this problem. I've been working on it for nearly a month, using the help from this forum, my school's forum, and waiting in vain for help from my teacher. I did get a small code file from him, which included the else/if statements you noted, but no guidance on how to fix my problems.

I didn't even notice the fact I was calling a Color class method with the input string name. I think I see something of what I need to do, based on your questions. I'll play w/ it a little more.

Thanks for the kick in the butt. :-P

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