Defined in header <stacktrace> | ||
|---|---|---|
template< class Allocator > class basic_stacktrace; | (1) | (since C++23) |
using stacktrace =
std::basic_stacktrace<std::allocator<std::stacktrace_entry>>;
| (2) | (since C++23) |
namespace pmr {
using stacktrace =
std::basic_stacktrace<std::pmr::polymorphic_allocator<std::stacktrace_entry>>;
}
| (3) | (since C++23) |
basic_stacktrace class template represents a snapshot of the whole stacktrace or its given part. It satisfies the requirement of AllocatorAwareContainer, SequenceContainer, and ReversibleContainer, except that only move, assignment, swap, and operations for const-qualified sequence containers are supported, and the semantics of comparison functions are different from those required for a container.The invocation sequence of the current evaluation \(\small{ {x}_{0} }\)x0 in the current thread of execution is a sequence \(\small{ ({x}_{0}, \dots, {x}_{n})}\)(x0, ..., xn) of evaluations such that, for \(\small{i \ge 0}\)i≥0, \(\small{ {x}_{i} }\)xi is within the function invocation \(\small{ {x}_{i+1} }\)xi+1.
A stacktrace is an approximate representation of an invocation sequence and consists of stacktrace entries.
A stacktrace entry represents an evaluation in a stacktrace. It is represented by std::stacktrace_entry in the C++ standard library.
| Allocator | - | An allocator that is used to acquire/release memory and to construct/destroy the elements in that memory. The type must meet the requirements of Allocator. The program is ill-formed if Allocator::value_type is not std::stacktrace_entry. |
| Member type | Definition |
|---|---|
value_type (C++23) | std::stacktrace_entry |
const_reference (C++23) | const value_type& |
reference (C++23) | value_type& |
const_iterator (C++23) | implementation-defined const LegacyRandomAccessIterator type that models random_access_iterator |
iterator (C++23) | const_iterator |
reverse_iterator (C++23) | std::reverse_iterator<iterator> |
reverse_const_iterator (C++23) | std::reverse_iterator<const_iterator> |
difference_type (C++23) | implementation-defined signed integer type |
size_type (C++23) | implementation-defined unsigned integer type |
allocator_type (C++23) | Allocator |
|
(C++23) | creates a new basic_stacktrace (public member function) |
|
(C++23) | destroys the basic_stacktrace (public member function) |
|
(C++23) | assigns to the basic_stacktrace (public member function) |
|
[static] (C++23) | obtains the current stacktrace or its given part (public static member function) |
|
(C++23) | returns the associated allocator (public member function) |
Iterators |
|
|
(C++23) | returns an iterator to the beginning (public member function) |
|
(C++23) | returns an iterator to the end (public member function) |
|
(C++23) | returns a reverse iterator to the beginning (public member function) |
|
(C++23) | returns a reverse iterator to the end (public member function) |
Capacity |
|
|
(C++23) | checks whether the basic_stacktrace is empty (public member function) |
|
(C++23) | returns the number of stacktrace entries (public member function) |
|
(C++23) | returns the maximum possible number of stacktrace entries (public member function) |
Element access |
|
|
(C++23) | access specified stacktrace entry (public member function) |
|
(C++23) | access specified stacktrace entry with bounds checking (public member function) |
Modifiers |
|
|
(C++23) | swaps the contents (public member function) |
|
(C++23) | compares the sizes and the contents of two basic_stacktrace values (function template) |
|
(C++23) | specializes the std::swap algorithm (function template) |
|
(C++23) | returns a string with a description of the basic_stacktrace (function template) |
|
(C++23) | performs stream output of basic_stracktrace (function template) |
|
(C++23) | hash support for std::basic_stacktrace (class template specialization) |
|
(C++23) | formatting support for basic_stacktrace (class template specialization) |
Support for custom allocators is provided for using basic_stacktrace on a hot path or in embedded environments. Users can allocate stacktrace_entry objects on the stack or in some other place, where appropriate.
The sequence of std::stacktrace_entry objects owned by a std::basic_stacktrace is immutable, and either is empty or represents a contiguous interval of the whole stacktrace.
boost::stacktrace::basic_stacktrace (available in Boost.Stacktrace) can be used instead when std::basic_stacktrace is not available.
| Feature-test macro | Value | Std | Comment |
|---|---|---|---|
__cpp_lib_stacktrace | 202011L | (C++23) | Stacktrace library |
__cpp_lib_formatters | 202302L | (C++23) | Formatting std::thread::id and std::stacktrace |
The output obtained using Compiler Explorer: msvc and gcc.
#include <iostream>
#include <stacktrace>
int nested_func(int c)
{
std::cout << std::stacktrace::current() << '\n';
return c + 1;
}
int func(int b)
{
return nested_func(b + 1);
}
int main()
{
std::cout << func(777);
}Possible output:
msvc output: 0> C:\Users\ContainerAdministrator\AppData\Local\Temp\compiler-explorer-compiler20221122-31624-2ja1sf.8ytzw\example.cpp(6): output_s!nested_func+0x1F 1> C:\Users\ContainerAdministrator\AppData\Local\Temp\compiler-explorer-compiler20221122-31624-2ja1sf.8ytzw\example.cpp(12): output_s!func+0x15 2> C:\Users\ContainerAdministrator\AppData\Local\Temp\compiler-explorer-compiler20221122-31624-2ja1sf.8ytzw\example.cpp(15): output_s!main+0xE 3> D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl(288): output_s!__scrt_common_main_seh+0x10C 4> KERNEL32!BaseThreadInitThunk+0x14 5> ntdll!RtlUserThreadStart+0x21 779 gcc output: 0# nested_func(int) at /app/example.cpp:7 1# func(int) at /app/example.cpp:13 2# at /app/example.cpp:18 3# at :0 4# at :0 5# 779
|
(C++23) | representation of an evaluation in a stacktrace (class) |
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