std::find 'error no matching function'

Question

Say that I have a class A and a class B that look like that:

Class A
{
private:
    int a;
public :
bool operator==(const A &) const;
//other methods(...)
}

Class B
{
private:
std::vector<A> v;
public:
std::vector<A> &get_v() {return v;};
const std::vector<A>& get_v() const;
}

Now when I do that:

B b;
std::vector<A>::iterator it;
it=std::find (b.get_v().begin(), b.get_v().end(), an item of class A);

The error I get is

error: no matching function for call to 'find(std::vector<A>::iterator, std::vector<A>::iterator, A&)

Am I missing something ? Thanks

score 129 · Accepted Answer · answered Feb 06 '14 at 17:12

129

You forgot to #include <algorithm>.

answered Feb 06 '14 at 17:12

Kerrek SB

464,522
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1,084

Yes I figured it out! Thanks – chiva Feb 06 '14 at 17:21
16

Nice, cryptic C++ error messages. Instead of saying, that std::find cannot be found (because of missing include), it says template argument deduction/substitution failed. – Nuclear May 13 '15 at 11:03
3

@Nuclear The point is that **an** `std::find()` can be found, but it's an overload with a different signature from a different header, which is not the one the OP was looking for. C++ is perfectly correct to complain in this case that the passed arguments do not enable resolution to any declared overload. If the cause were that _"std::find cannot be found"_, then the error would be _"std::find was not declared in this scope"_ or suchlike. – underscore_d Jul 26 '17 at 16:25
When I saw this, I was like yeah right... Let me just check-- then woah it was true! :) – xilpex May 22 '20 at 23:17

score 12 · Answer 2 · answered Feb 06 '14 at 17:14

12

I think you forgot include header <algorithm>

answered Feb 06 '14 at 17:14

Vlad from Moscow

301,070
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parmod · Answer 3 · 2018-03-29T07:36:33.367

-6

You forgot include this header file

#include<vector>

.

edited Mar 29 '18 at 07:36

answered Mar 29 '18 at 07:31

parmod

25
4

1

This is not the solution! – Scott May 22 '20 at 07:17

std::find 'error no matching function'

3 Answers3

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