Dev-c++ No Match For Operator

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  • Jan 05, 2009  no match for operator in C? Sun Jan 04, 2009 7:23 pm Hey guys, I'm kinda new to C, I've been programming in C for some time though, although I'm not really that great at it.
  1. Dev C++ No Match For Operator
  2. Dev C++ No Match For Operator
Dev-c++ No Match For Operator

Good afternoon Daniweb, I have a simple (and probably idiotic) problem today, I have a simplistic program that simulates a Train station, trains come in, they go into a stationDock and come out after a while.
The stationDocks are an array of trains, either pointing to a train or being NULL (at least that's what it should be, I probly did an error somewhere in the implementation)

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WideVar.cpp: In static member function ‘static void wideVar::freeDock(int)’:
WideVar.cpp:67: error: no match for ‘operator=’ in ‘*(((Train*)(((unsigned int)i) * 36u)) + wideVar::stationDocks) = 0’
Train.h:7: note: candidates are: Train& Train::operator=(const Train&)
WideVar.cpp: In static member function ‘static bool wideVar::dockIsEmpty(int)’:
WideVar.cpp:69: error: no match for ‘operator’ in ‘*(((Train*)(((unsigned int)i) * 36u)) + wideVar::stationDocks) 0’
WideVar.cpp: In static member function ‘static void wideVar::setDock(int, Train*)’:
WideVar.cpp:71: error: no match for ‘operator=’ in ‘*(((Train*)(((unsigned int)i) * 36u)) + wideVar::stationDocks) = train’
Train.h:7: note: candidates are: Train& Train::operator=(const Train&)
WideVar.cpp: In static member function ‘static int wideVar::compareDock(int, Train*)’:
WideVar.cpp:73: error: base operand of ‘->’ has non-pointer type ‘Train’
WideVar.cpp:73: error: expected `}' at end of input

The compiler gets no match in cases of parameter-types-incompatibilities. The 'name' of the compare method is correct, that's clear: 'operator'. Best regards, Wolf Peuker Noorez Kassam schrieb: I'm having trouble using a template that i have. I'm making a template class, and overloaded the comparison operator. The function below should.

P.S. I commented out (only in the example) the parts of the code unrelated to the problem.

Thank you very much for your help!

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  • commentLatest Postby jonyb222Latest Post

vmanes1,165

You're trying to assign NULL to a Train object, or to compare NULL to a Train object. You haven't overloaded the = and operators, and it wouldn't make sense to assign or compare NULL in any case.

ar is the pointer - that can be assigned or compared to NULL. But assigning NULL will orphan your entire array of Train objects.

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If your goal is to show that an element of the ar array is available, you might add a marker to the Train objects (valid or invalid).

If you want to be able to actually delete a Train object, consider making ar a pointer to pointers.

< cpp‎ language
C++

Dev C++ No Match For Operator

Language
Standard Library Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library(C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Iterators library
Ranges library(C++20)
Algorithms library
Numerics library
Input/output library
Localizations library
Regular expressions library(C++11)
Atomic operations library(C++11)
Thread support library(C++11)
Filesystem library(C++17)
Technical Specifications
Statements
Labels
label : statement
Expression statements
expression ;
Compound statements
{ statement.. }
Selection statements
if
switch
Iteration statements
while
do-while
for
range for(C++11)
Jump statements
break
continue
return
goto
Declaration statements
declaration ;
Try blocks
try compound-statementhandler-sequence
Transactional memory
synchronized, atomic_commit, etc(TM TS)

Terminates the current function and returns the specified value (if any) to its caller.

  • 3Notes

[edit]Syntax

attr(optional)returnexpression(optional); (1)
attr(optional)returnbraced-init-list; (2)(since C++11)
attr(optional)co_returnexpression(optional); (3)(since C++20)
attr(optional)co_returnbraced-init-list; (4)(since C++20)
attr(C++11) - optional sequence of any number of attributes
expression -expression, convertible to the function return type
braced-init-list - brace-enclosed list of initializers and other braced-init-lists

[edit]Explanation

1) Evaluates the expression, terminates the current function and returns the result of the expression to the caller, after implicit conversion to the function return type. The expression is optional in functions whose return type is (possibly cv-qualified) void, and disallowed in constructors and in destructors.
2) Uses copy-list-initialization to construct the return value of the function.
3,4) In a coroutine, the keyword co_return must be used instead of return for the final suspension point (see coroutines for details).

[edit]Notes

If control reaches the end of a function with the return type void (possibly cv-qualified), end of a constructor, end of a destructor, or the end of a function-try-block for a function with the return type (possibly cv-qualified) void without encountering a return statement, return; is executed.

If control reaches the end of the main function, return0; is executed.

Flowing off the end of a value-returning function (except main) without a return statement is undefined behavior.

In a function returning void, the return statement with expression can be used, if the expression type is void.

The copy-initialization of the result of the function call is sequenced-before the destruction of all temporaries at the end of expression, which, in turn, is sequenced-before the destruction of local variables of the block enclosing the return statement.

(since C++14)

Returning by value may involve construction and copy/move of a temporary object, unless copy elision is used. Specifically, the conditions for copy/move are as follows:

automatic move from local variables and parameters

If expression is a (possibly parenthesized) id-expression that names a variable whose type is either

  • a non-volatile object type or
  • a non-volatile rvalue reference to object type
(since C++20)

, and that variable is declared

  • in the body or
  • as a parameter of
the innermost enclosing function or lambda expression,

then overload resolution to select the constructor to use for initialization of the returned value or, for co_return, to select the overload of promise.return_value()(since C++20) is performed twice:

  • first as if expression were an rvalue expression (thus it may select the move constructor), and
  • if the first overload resolution failed
  • or it succeeded, but did not select the move constructor (formally, the first parameter of the selected constructor was not an rvalue reference to the (possibly cv-qualified) type of expression)
(until C++20)
  • then overload resolution is performed as usual, with expression considered as an lvalue (so it may select the copy constructor).
(since C++11)

guaranteed copy elision

If expression is a prvalue, the result object is initialized directly by that expression. This does not involve a copy or move constructor when the types match (see copy elision).

(since C++17)

[edit]Keywords

return,co_return

[edit]Example

Output:

[edit]Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

Dev C++ No Match For Operator

DR Applied to Behavior as published Correct behavior
CWG 1579 C++11 return by converting move constructor was not allowed converting move constructor look up enabled
CWG 1885 C++14 sequencing of the destruction of automatic variables was not explicit sequencing rules added


[edit]See also

C documentation for return statement
Retrieved from 'https://en.cppreference.com/mwiki/index.php?title=cpp/language/return&oldid=115005'