October 2004
Intermediate to advanced
624 pages
16h 2m
English
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Chapter 27. Subscript Operators
Pointer Conversion versus Subscript Operators
I mentioned earlier (see section 14.2.2) that one must choose between providing implicit conversion to a pointer (to the managed sequence) or subscript operators. In this section, we'll see why. Consider the code in Listing 27.1.
Example 27.1.
typedef size_t subscript_arg_t;
typedef int indexer_t;
struct DoubleContainer
{
typedef size_t size_type;
operator double const *() const;
operator double *();
double const &operator [](size_type index) const;
double &operator [](size_type index);
size_type size() const;
};
. . .
DoubleContainer dc;
indexer_t index = 1;
dc[index]; // S#1
dc[0]; // S#2
Most types that provide subscripting can only support non-negative indexes, so ...
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