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Thread: do while with find_if

  1. #1
    Join Date
    May 2015
    Posts
    431

    do while with find_if

    Hello,

    Code:
    	std::map<int,  bool >									m_TacToAssignFlag;
    
    	auto itr = m_TacToAssignFlag.begin();
    
    	do
    	{
                    ################
                    some more code here
                    ################
    		bool bTacAssignCompl(false);
    
    		auto itr = std::find_if(m_TacToAssignFlag.begin(), m_TacToAssignFlag.end(), [bTacAssignCompl](const auto& elem) {return elem.second == bTacAssignCompl; }) ;
    
    	} while(itr != m_TacToAssignFlag.end());
    In the above code, when the itr is m_TacToAssignFlag.end(), it still goes inside.

    i used the find_if, to check , if any values in the map, is false..

    Not sure what i am doing wrong

    thanks a lot
    pdk

  2. #2
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
    Join Date
    Jan 2003
    Location
    Hanover Germany
    Posts
    19,961

    Re: do while with find_if

    You redefine the auto itr within the do/while loop.
    Is it by design?
    Victor Nijegorodov

  3. #3
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012
    Location
    England
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    7,465

    Re: do while with find_if

    Code:
    auto itr = std::find_if......
    The scope of this itr only exists until the block closing }. It does not extend to the while clause. The itr used in the while clause is the same as that defined before the do loop.

    You probably mean:

    Code:
    itr = std::find_if(
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++20 Compiler: Microsoft VS2019 (16.9.3)

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