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Questions tagged [implicit-conversion]

Converting an object, variable or value from one type to another to satisfy a type restriction, without specifically requesting that conversion through language syntax.

Converting an object, variable or value from one type to another to satisfy a type restriction, without specifically requesting that conversion through language syntax.

Implicit conversion is a subset of .

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Problem with implicit conversions and higher-order apply methods in Scala

I am trying to extend String with a new apply method that lets me apply an higher-order function on it. Example: case class A(s:String, f: List[String] => List[String]) val f: List[String] => List[String] = { ... stuff ... } "foo"{f} // == A("foo",…
Rouzbeh Delavari
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do variables automatically convert to the type required by the function as the appropriate arguments?

do variables automatically convert to the type required by the function as the appropriate arguments? #include void swap(int &i, int &j) { //the arguments here are int& int temp = i; i = j; j = temp; } int main(void) { int a =…
Why'd of Vir
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Make use of implicit conversion operator inside expression tree

Suppose I have the following type with an implicit convertion operator: public readonly struct WrappedInt { public WrappedInt(int value) { Value = value; } public int Value { get; } public static implicit operator int…
Yuriy Ivaskevych
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Implicit conversion from uint8_t to int gone wrong, when explicit one gone well

I've got a program, which gets numbers n(quantity of blocks) and r(volume), and after it gets n sizes in format firstsize secondsize thirdsize (e.g. 1 1 1) so the overall simplest input is: 1 1 1 1 1 which in theory should return 1. But it…
Quakumei
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Ambiguous concept of conversion in Java

I really find the concept of conversion to be confusing. short a = 34; short b = (short)34; What is the linguistic difference between these two statements? I think that, in the first statement the int literal 34 is directly stored in the short…
user12208242
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Scala: why type conversion implicit breaks the code

I have a simple code private def convertFieldsNames (fieldsNames: Array[String]): Array[String] = fieldsNames.map(convertFieldName) private def convertFieldName (fieldName: String): String = s"!!! $fieldName" val res =…
Dmitry Reutov
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Implicit casting limitations

I am trying to support implicit casts of literal values in a type system. These implicit casts are intended and ideal (See note 1). I'm aware that C++ can perform multiple implicit casts in an expression. The second line of main below does not…
ktb
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Cannot convert const object in Return

I'm not entirely sure what I'm doing incorrectly here. I have a class which contains a constant pointer to another class object. However I'm getting an error about not being able to convert the const (class object). What am I doing wrong? Is my code…
JokerMartini
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error: cannot convert 'const char**' to 'const char (*)[64]'

I try to implement source code as below: bool getParam(char* cmd, char** prm_arr, int num) { } void main() { char strC[] = "btOK,btCancel"; char foo[10][10]; bool res = getParam(strC,foo,2); } It shows error: error: cannot convert…
ThomasD
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c++ no suitable conversion function from "std::string" to "const char*" exists

the question as the title suggests, is an error when i was executing my program in the certain part of the password function. actually it is a basic password function which was working properly in turbo c++, but in visual c++ this error arrives…
Shazin
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Temporary materialization conversion not in a standard conversion sequence

Temporary materialization conversion is a standard conversion, see § 7.3 Standard Conversions; 7.3.4 [conv.rval]: A prvalue of type T can be converted to an xvalue of type T. This conversion initializes a temporary object ([class.temporary]) of…
Krystian S
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C++ ifstream::read confusion

I would like to iterate through the bytes of a file stream. I am using ifstream class. When you use the read function, it copies characters from the stream into the array that I specify in the argument list. I have 3 questions. int length =…
Patrik Nusszer
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getting Suspicious application of an implicit view when converting from Option(lang.Long) to Long

after adding this flag to scalacoptions : "-Xlint:option-implicit" I don't understand why am I getting this and how to resolve it Error:(47, 34) Suspicious application of an implicit view (scala.Predef.Long2long) in the argument to…
igx
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Implicit downcast of shared_ptr in CRTP

I built a class Interface to be used with CRTP for static polymorphism and a Client class having a shared_ptr to the Interface. I would like to return from the Client the shared_ptr to the Implementation, something that I can (safely?) do through…
Teloze
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prevent string literals from being converted to bool versus std::string

Similar questions have been asked before, such as String literal matches bool overload instead of std::string. But what I want to know is what should C++ developers do to prevent this from happening? As someone who writes C++ libraries for others…
Stéphane
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