C-Wrapper for GEOS library * * Copyright C 2010 2011
You can use a const_cast if you want to, but it's not really needed -- non-const can be converted to const implicitly. const_cast can be used to add const ness behavior too. This type of casting manipulates the constness of an object, either to be set or to be removed. Se hela listan på 10xlearner.com Note that just because a function is declared const that doesn't prohibit non-const functions from using it; the rule is this: Const functions can always be called Non-const functions can only be called by non-const objects That makes sense: if you have a const function, all that means is that it guarantees it won't change the object. In this case, you need to break API and make Random non-const to properly indicate to callers that it modifies the object state (if the modifications only affect physical constness and not logical constness you could use mutable attributes and propagate const).
const int *ptr_1 = &value; // ptr_1 points to a “const int” value, so this is a pointer to a const value. 3. int *const ptr_2 = &value; // ptr_2 points to an “int”, so this is a const pointer to a non-const value. That will require as to use 'const_cast' to remove the const qualifier.
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Data Definitions for libc - Linux Foundation
It does NOT define a constant value. It defines a constant reference to a value. Because of this, we cannot change constant primitive values, but we can change the properties of constant objects.
src/include/nodes/bitmapset.h - PostgreSQL Source Code
Not Real Constants. The keyword const is a little misleading.. It does NOT define a constant value. It defines a constant reference to a value. Because of this, we cannot change constant primitive values, but we can change the properties of constant objects. Have the const method cast away const-ness (and hence call the non-const method)?
Answers: const_cast can be used in order remove or add constness to an object.
Because of this, we cannot change constant primitive values, but we can change the properties of constant objects. Have the const method cast away const-ness (and hence call the non-const method)?
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Lösningsförslag, Tentamen i C++ - Lunds tekniska högskola
1) const_cast can be used to change non-const class members inside a const member function.