18 Diagnostics library [diagnostics]

18.2 Exception classes [std.exceptions]

18.2.7 Class runtime_­error [runtime.error]

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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Effects: Constructs an object of class runtime_­error.
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Ensures: strcmp(what(), what_­arg.c_­str()) == 0.
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runtime_error(const char* what_arg);
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Effects: Constructs an object of class runtime_­error.
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Ensures: strcmp(what(), what_­arg) == 0.