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## Assertions <a id="assertions">[[assertions]]</a>
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The header `<cassert>`
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C++program assertions and a mechanism for disabling the assertion
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checks.
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## Assertions <a id="assertions">[[assertions]]</a>
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The header `<cassert>` provides a macro for documenting C++program
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assertions and a mechanism for disabling the assertion checks.
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### Header `<cassert>` synopsis <a id="cassert.syn">[[cassert.syn]]</a>
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``` cpp
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#define assert(E) see below
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```
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The contents are the same as the C standard library header `<assert.h>`,
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except that a macro named `static_assert` is not defined.
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ISO C 7.2.
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### The `assert` macro <a id="assertions.assert">[[assertions.assert]]</a>
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An expression `assert(E)` is a constant subexpression (
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[[defns.const.subexpr]]), if
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- `NDEBUG` is defined at the point where `assert` is last defined or
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redefined, or
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- `E` contextually converted to `bool` (Clause [[conv]]) is a constant
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subexpression that evaluates to the value `true`.
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