19 Diagnostics library [diagnostics]

19.6 Stacktrace [stacktrace]

19.6.3 Class stacktrace_entry [stacktrace.entry]

19.6.3.1 Overview [stacktrace.entry.overview]

namespace std { class stacktrace_entry { public: using native_handle_type = implementation-defined; // [stacktrace.entry.cons], constructors constexpr stacktrace_entry() noexcept; constexpr stacktrace_entry(const stacktrace_entry& other) noexcept; constexpr stacktrace_entry& operator=(const stacktrace_entry& other) noexcept; ~stacktrace_entry(); // [stacktrace.entry.obs], observers constexpr native_handle_type native_handle() const noexcept; constexpr explicit operator bool() const noexcept; // [stacktrace.entry.query], query string description() const; string source_file() const; uint_least32_t source_line() const; // [stacktrace.entry.cmp], comparison friend constexpr bool operator==(const stacktrace_entry& x, const stacktrace_entry& y) noexcept; friend constexpr strong_ordering operator<=>(const stacktrace_entry& x, const stacktrace_entry& y) noexcept; }; }
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An object of type stacktrace_entry is either empty, or represents a stacktrace entry and provides operations for querying information about it.
The class stacktrace_entry models regular ([concepts.object]) and three_way_comparable<strong_ordering> ([cmp.concept]).

19.6.3.2 Constructors [stacktrace.entry.cons]

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constexpr stacktrace_entry() noexcept;
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Postconditions: *this is empty.

19.6.3.3 Observers [stacktrace.entry.obs]

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constexpr native_handle_type native_handle() const noexcept;
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The semantics of this function are implementation-defined.
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Remarks: Successive invocations of the native_handle function for an unchanged stacktrace_entry object return identical values.
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constexpr explicit operator bool() const noexcept;
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Returns: false if and only if *this is empty.

19.6.3.4 Query [stacktrace.entry.query]

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[Note 1: 
All the stacktrace_entry query functions treat errors other than memory allocation errors as “no information available” and do not throw in that case.
— end note]
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string description() const;
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Returns: A description of the evaluation represented by *this, or an empty string.
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Throws: bad_alloc if memory for the internal data structures or the resulting string cannot be allocated.
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string source_file() const;
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Returns: The presumed or actual name of the source file ([cpp.predefined]) that lexically contains the expression or statement whose evaluation is represented by *this, or an empty string.
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Throws: bad_alloc if memory for the internal data structures or the resulting string cannot be allocated.
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uint_least32_t source_line() const;
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Returns: 0, or a 1-based line number that lexically relates to the evaluation represented by *this.
If source_file returns the presumed name of the source file, returns the presumed line number; if source_file returns the actual name of the source file, returns the actual line number.
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Throws: bad_alloc if memory for the internal data structures cannot be allocated.

19.6.3.5 Comparison [stacktrace.entry.cmp]

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friend constexpr bool operator==(const stacktrace_entry& x, const stacktrace_entry& y) noexcept;
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Returns: true if and only if x and y represent the same stacktrace entry or both x and y are empty.