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Fixed some typos in section ES.31.

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drusk 2015-10-29 19:53:44 -07:00
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@ -7985,22 +7985,22 @@ Scream when you see a macro that isn't just use for source control (e.g., `#ifde
Macros are a major source of bugs.
Macros don't obey the usual scope and type rules.
Macros don't obey the usual rules for argument passing.
Macros ensure that the human reader see something different from whet the compiler sees.
Macros complicates tool building.
Macros ensure that the human reader sees something different from what the compiler sees.
Macros complicate tool building.
##### Example, bad
#define PI 3.14
#define SQUARE(a, b) (a*b)
Even if we hadn't left a well-know bug in `SQUARE` there are much better behaved alternatives; for example:
Even if we hadn't left a well-known bug in `SQUARE` there are much better behaved alternatives; for example:
constexpr double pi = 3.14;
template<typename T> T square(T a, T b) { return a*b; }
##### Enforcement
Scream when you see a macro that isn't just use for source control (e.g., `#ifdef`)
Scream when you see a macro that isn't just used for source control (e.g., `#ifdef`)
### <a name="Res-CAPS!"></a> ES.32: Use `ALL_CAPS` for all macro names