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C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)    
(C++20)
Swap and type operations
(C++20)
(C++14)
(C++11)
(C++23)
(C++11)
(C++23)
(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
(C++17)
(C++17)
(C++17)
(C++11)
(C++11)
(C++17)
(C++17)
(C++23)



 
Diagnostics library
 
std::error_code
 
explicit operator bool() const noexcept;
(since C++11)

Checks if the error code value is valid, i.e. non-zero.

Parameters

(none)

Return value

false if value() == 0, true otherwise.

Notes

Although this operator is often used as a convenient shorthand to check if any error was returned, as in if (ec) { /* handle error */ }, such use is not robust: some error codes, for example, HTTP status code 200, may indicate success as well.