Decrement operators

Synopses

Declared in <mp‐units/utility/constrained.h>

Pre‐decrements the wrapped value.

constexpr
constrained&
operator‐‐()
requires requires(T& v) {
      { ‐‐v } ‐> std::same_as<T&>;
    };

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Post‐decrements the wrapped value.

constexpr
constrained<decltype(std::declval<T&>()‐‐), ErrorPolicy>
operator‐‐(int tag);

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Return Value

  • a reference to *this, after decrementing

  • the value before decrementing, wrapped in constrained

Parameters

Name

Description

tag

unused; disambiguates this postfix overload from the prefix operator‐‐()

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