Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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unit_test::suite::fail

Record a failure.

template<
    class String>
void
fail(
    String const& reason,
    char const* file,
    int line);
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template<
    class = void>
void
fail(
    std::string const& reason = "");
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