19 Diagnostics library [diagnostics]

19.2 Exception classes [std.exceptions]

19.2.8 Class runtime_error [runtime.error]

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namespace std { class runtime_error : public exception { public: explicit runtime_error(const string& what_arg); explicit runtime_error(const char* what_arg); }; }
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The class runtime_error defines the type of objects thrown as exceptions to report errors presumably detectable only when the program executes.
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runtime_error(const string& what_arg);
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Postconditions: strcmp(what(), what_arg.c_str()) == 0.
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runtime_error(const char* what_arg);
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Postconditions: strcmp(what(), what_arg) == 0.