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    <p>Here's a template based version:</p> <pre><code>#include &lt;iostream&gt; #include &lt;iomanip&gt; enum endianness_t { BIG, // 0x44332211 =&gt; 0x44 0x33 0x22 0x11 LITTLE, // 0x44332211 =&gt; 0x11 0x22 0x33 0x44 UNKNOWN }; const uint32_t test_value = 0x44332211; const bool is_little_endian = (((char *)&amp;test_value)[0] == 0x11) &amp;&amp; (((char *)&amp;test_value)[1] == 0x22); const bool is_big_endian = (((char *)&amp;test_value)[0] == 0x44) &amp;&amp; (((char *)&amp;test_value)[1] == 0x33); const endianness_t endianness = is_big_endian ? BIG: (is_little_endian ? LITTLE : UNKNOWN); template &lt;typename T&gt; T identity(T v){ return v; } // 16 bits values ------ uint16_t swap_(uint16_t v){ return ((v &amp; 0xFF) &lt;&lt; 8) | ((v &amp; 0xFF00) &gt;&gt; 8); } // 32 bits values ------ uint32_t swap_(uint32_t v){ return ((v &amp; 0xFF) &lt;&lt; 24) | ((v &amp; 0xFF00) &lt;&lt; 8) | ((v &amp; 0xFF0000) &gt;&gt; 8) | ((v &amp; 0xFF000000) &gt;&gt; 24); } template &lt;typename T, endianness_t HOST, endianness_t REMOTE&gt; struct en_swap{ static T conv(T v){ return swap_(v); } }; template &lt;typename T&gt; struct en_swap&lt;T, BIG, BIG&gt;{ static T conv(T v){ return v; } }; template &lt;typename T&gt; struct en_swap&lt;T, LITTLE, LITTLE&gt; { static T conv(T v){ return v; } }; template &lt;typename T&gt; T to_big(T v) { switch (endianness){ case LITTLE : return en_swap&lt;T,LITTLE,BIG&gt;::conv(v); case BIG : return en_swap&lt;T,BIG,BIG&gt;::conv(v); } } template &lt;typename T&gt; T to_little(T v) { switch (endianness){ case LITTLE : return en_swap&lt;T,LITTLE,LITTLE&gt;::conv(v); case BIG : return en_swap&lt;T,BIG,LITTLE&gt;::conv(v); } } int main(){ using namespace std; uint32_t x = 0x0ABCDEF0; uint32_t y = to_big(x); uint32_t z = to_little(x); cout &lt;&lt; hex &lt;&lt; setw(8) &lt;&lt; setfill('0') &lt;&lt; x &lt;&lt; " " &lt;&lt; y &lt;&lt; " " &lt;&lt; setw(8) &lt;&lt; setfill('0') &lt;&lt; z &lt;&lt; endl; } </code></pre>
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