# std::stacktrace_entry

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< cpp‎ | utility

Defined in header `<stacktrace>` |  |
class stacktrace_entry; |  | (since C++23)

The `stacktrace_entry` class provides operations for querying information about an evaluation in a stacktrace. Each `stacktrace_entry` object is either empty, or represents an evaluation in a stacktrace.

`stacktrace_entry` models std::regular and std::three_way_comparable < std::strong_ordering >.

### Member types

`native_handle_type` | implementation-defined native handle type

### Member functions

(constructor) | constructs a new `stacktrace_entry` (public member function)
(destructor) | destroys the `stacktrace_entry` (public member function)
operator= | assigns the contents of one `stacktrace_entry` to another (public member function)

##### Observers

native_handle | gets the implementation-defined native handle of the `stacktrace_entry` (public member function)
operator bool | checks whether the `stacktrace_entry` is empty (public member function)

##### Query

description | gets the description of the evaluation represented by the `stacktrace_entry` (public member function)
source_file | gets the name of the source file that lexically contains the expression or statement whose evaluation is represented by the `stacktrace_entry` (public member function)
source_line | gets the line number that lexically relates the evaluation represented by the `stacktrace_entry` (public member function)

### Non-member functions

operator==operator<=> (C++23) | compares two `stacktrace_entry` values (function)
to_string (C++23) | returns a string with a description of the `stacktrace_entry` (function)
operator<< (C++23) | performs stream output of `stacktrace_entry` (function template)

### Helper classes

std::hash<std::stacktrace_entry> (C++23) | hash support for `std::stacktrace_entry` (class template specialization)
std::formatter<std::stacktrace_entry> (C++23) | formatting support for `stacktrace_entry` (class template specialization)

### Notes

`boost::stacktrace::frame` (available in Boost.Stacktrace) can be used instead when `std::stacktrace_entry` is not available.

Feature-test macro | Value | Std | Feature
--- | --- | --- | ---
`__cpp_lib_stacktrace` | `202011L` | (C++23) | Stacktrace library

### Example

| This section is incomplete Reason: no example

### See also

basic_stacktrace (C++23) | approximate representation of an invocation sequence consists of stacktrace entries (class template)
source_location (C++20) | a class representing information about the source code, such as file names, line numbers, and function names (class)

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