Is const evaluated at compile time?
In const contexts, these are the only expressions allowed, and they are always evaluated at compile time. The following expressions are constant expressions, as long as the operands are also constant expressions and do not cause any Drop::drop calls to be executed. literals. Constant parameters.
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What does a const function mean in C++?
The const keyword specifies that the value of a variable is constant and tells the compiler to prevent the programmer from changing it. A pointer to a variable declared as const can only be assigned to a pointer that is also declared as const .
Can a constant function call a non-constant function?
The const member functions can be called for const and non-const objects. Non-constant member functions can only be called for non-constant objects. If a non-constant member function is called on a constant object, it is a compiler error.
What does a const method mean?
The const member functions are the functions that are declared as constants in the program. The object called by these functions cannot be modified. It is recommended to use the const keyword to avoid accidental changes to the object. Non-constant functions can only be called by non-constant objects.
What is const member function?
The const member functions are the functions that are declared as constants in the program. The object called by these functions cannot be modified. It is recommended to use the const keyword to avoid accidental changes to the object. Any type of object can call a constant member function.
When can a function be constant?
A function is converted to const when the const keyword is used in the function declaration. The idea of const functions is to not allow them to modify the object they are called on. The practice of making as many functions constant as possible is recommended to avoid accidental changes to objects.
Can a member function be declared as const?
Like member functions and member function arguments, objects of a class can also be declared as const. An object declared as const cannot be modified, and therefore can only call const member functions, since these functions guarantee that the object is not modified.
What is the difference between runtime constant and compile time constant?
A runtime constant is a value that is calculated only while the program is running. If you run the same program more than once: a compile-time constant will have the same value each time
When does constexpr return a compile time constant?
Consuming code requires the return value at compile time, for example, to initialize a constexpr variable or provide a non-typed template argument. When its arguments are constexpr values, a constexpr function produces a compile-time constant.
Is the getValue function at runtime constexpr?
In the last statement in main(), the member function of constexpr GetValue() is a run-time call because the value does not need to be known at compile time.