Operators in C and C++: Difference between revisions

Revision as of 20:52, 14 February 2025

Revision as of 01:16, 20 March 2025

Line 69:

| {{rh}} colspan="2" | Postfix increment

| align="center" | <code>a'''++'''</code>

| {{cpp|1=R K::operator ++(int);}} {{efn|name=dummy-int|The {{cpp|int}} is a dummy parameter to differentiate between prefix and postfix.}}

| {{cpp|1=R operator ++(K& a, int);}} {{efn|name=dummy-int}}

|-

| {{rh}} colspan="2" | Prefix [[Increment and decrement operators|decrement]]

Line 79:

| {{rh}} colspan="2" | Postfix decrement

| align="center" | <code>a'''--'''</code>

| {{cpp|1=R K::operator --(int);}} {{efn|name=dummy-int}}

| {{cpp|1=R operator --(K& a, int);}} {{efn|name=dummy-int}}

|}

Line 384:

| {{n/a}}

|-

| {{rh}} colspan="2" | [[type conversion|Conversion]] {{efn|Behaves like const_cast/static_cast/reinterpret_cast. In the last two cases, the <code>auto</code> specifier is replaced with the type of the invented variable x declared with <code>auto x(a);</code> (which is never interpreted as a function declaration) or <code>auto x{a};</code>, respectively.}}<ref>[https://en.cppreference.com/w/cpp/language/explicit_cast Explicit type conversion] in C++</ref>

| style="text-align:center;" | <code>R(a)</code><br><code>R{a}</code><ref name="sinceCXX11" group="lower-alpha" /><br><code>auto(a)</code><ref name="sinceCXX23" group="lower-alpha" /><br><code>auto{a}</code><ref name="sinceCXX23" group="lower-alpha" /> || {{no}} || {{no}}

| {{rh}} colspan="2" {{n/a}}

|-

| {{rh}} colspan="2" | [[static_cast]] conversion {{efn|For user-defined conversions, the return type implicitly and necessarily matches the operator name unless the type is inferred (e.g. {{cpp|1=operator auto()}}, {{cpp|1=operator decltype(auto)()}} etc.).}}

| style="text-align:center;" | <code>'''static_cast'''<R>(a)</code> || {{yes}} || {{no}}

| {{cpp|1=K::operator R();}}<br>{{cpp|1=explicit K::operator R();}}<ref name="sinceCXX11" group="lower-alpha" />